v5.3
  - Fixed a bug with FPS computation that could cause the pattern to hang
    temporarily.
  - Contact email address and gtklife web URL updated.

v5.2
  - Somewhere along the way, new versions of Gtk broke my method
    of changing the start/stop toolbar image. Fixed.
  - Added -lX11 to link options for gtk2, since apparently
    pkg-config --libs gtk+-2.0 no longer includes that.
  - Removed a few unused variables (fixes compiler warnings).

v5.1
Improvements merged from and/or inspired by LucidLife:
  - Added radio buttons for drawing and selecting to the edit menu, with
    corresponding toolbar buttons
  - Separate cursors for drawing and selecting
  - The coordinates display is now always active. If the mouse pointer is
    outside of the box, it shows the coordinates of the upper-left corner.
    Tracking the mouse while the pattern is running causes no appreciable
    slowdown on my system; let me know if it does on yours.

  - Rudimentary autoconf support. The regular Makefile is still there and
    works pretty much the same as before. That's what I'll be using, because I
    hate autotools :-P
  - Help browser selection has been made more intelligent, with preset command
    lines for mozilla and firefox. When the user first attempts to access a
    help file, he is asked to configure a help browser.
  - Made the various scrolling actions visible in the menu (View->Scroll), so
    that their keybindings will work under Gtk2
  - Fixed speed slider jitter under Gtk2
  - Pared down the toolbar (it was getting too wide for the excessively-spaced
    default gtk2 toolbar)
  - Now using transient dialogs
  - Fixed dialog centering under Gtk2
  - Fixed custom keybindings under Gtk2
  - "last_version" setting added to preferences file, so gtklife knows what
    version the user last ran.
  - Replaced the += syntax in the Makefile with "VAR:=$(VAR) [new stuff]",
    since apparently += isn't universally supported.

v5.0
  - Gtk2 is now supported (Gtk1 is still the default, edit Makefile to change).
    gtklife+gtk2 should be considered beta quality at this time. Bug reports
    welcome.
  - Fixed undefined behavior in alpha_blend()
  - No longer hide menubar in fullscreen mode (potentially confusing, and
    besides, gtk2 doesn't seem to like it)
  - The mouse wheel now scrolls left and right when holding shift, and zooms
    in and out when holding control (idea thanks to John Spray).
  - Default speed-slider maximum increased to 1000 ticks/sec
  - Added INSTALL (symlink to README) and AUTHORS files.

v4.2
  - Fixed a potential crash after saving patterns (thanks Ian Bloom).
  - Removed -mpentiumpro from the Makefile.
  - Zoom 1:1 and 16:1 buttons are now grayed out when appropriate.
  - Rearranged zoom buttons to be more logical.

v4.1
  COSMETIC/USABILITY IMPROVEMENTS
  - The File->Description dialog now updates automatically if you leave it open
    while loading a new pattern file. Also, any previous description dialog is
    closed when you open a new one.
  - GtkLife now issues a warning dialog if it appears the application was not
    propery installed (i.e., "make" without "make install").
  - GtkLife now issues a warning dialog if the configured pattern collection
    is not found.

  BUG FIXES
  - Fixed a bug that prevents the start/stop button from changing color when
    Gtk+ has debugging enabled (thanks to James Gregory for reporting).
  - Fixed stair-stepping effect when drawing diagonal lines.

  MISCELLANEOUS
  - Better ChangeLog :-)

v4.0
  NEW FUNCTIONALITY
  - The world size has been bumped up to 1 million x 1 million.
  - Added View->Find Active Cells, to locate a live (and preferably active)
    region and center on it.
  - gtklife has a new default file format, GLF, which is similar to RLE.
  - gtklife can now handle multiple file formats: Life 1.05 (the original
    format), Life 1.06, RLE, XLife, and GLF. File type is auto-detected when
    loading. Information on file formats was added to the "File Handling"
    section of the documentation, and a page was added giving detailed
    information on the GLF format.
  - You can now set a per-session pattern directory
    (File->Change Pattern Collection) as well as a default pattern directory
    (Preferences/File/Default Pattern Collection).
  - Sidebar patterns can now be bundled into sub-directories. Directories will
    be displayed with trailing slashes. Click on a directory name to display
    its contents in a clickable list beneath the sidebar.
  - You can now specify a pattern collection directory on the command line
    (previously only individual patterns could be loaded via command line).
  - The pattern description has been made unbounded in length and width. An
    error will occur if you attempt to save a pattern with a too-large
    description to a LIF or RLE pattern file.

  COSMETIC/USABILITY IMPROVEMENTS
  - Mouse wheel over the description text box now scrolls the description
    (previously you had to hover the mouse over the scrollbar).
  - The color picker in Preferences now uses the contents (if any) of the
    corresponding text entry as its starting color.
  - Recent files in the File menu now display full path as a tooltip.
  - Sidebar scrollbar is now only displayed when needed.

  PATTERN COLLECTION CHANGES
  - A new pattern collection, JSLife by Jason Summers, is now available as an
    option. The sidebar can be set to display the original LifeP, JSLife, or
    a custom collection of your own.
  - Patterns were reorganized into a hierarchical format.
  - Patterns were renamed to be more human-readable.
  - Patterns were converted to GLF for speed of loading.
  - Pattern descriptions were reformatted.
  - Paul Rendell's Turing Machine pattern was added to the LifeP collection.
  - Added a longer description to the Unit Cell pattern.
  - Now that we have a command to locate active cells, re-centered the Jaws
    pattern.
  - Note: Due to a minor change in the config file, any custom pattern
    directory that you have chosen previously will be reset.

  DOCUMENTATION IMPROVEMENTS
  - Fixed broken link to the Scientific American article in help.

  MISCELLANEOUS
  - The install process now deletes any existing patterns bundle before copying
    over the new patterns.
  - Added new nifty program icons based on the "pulsar".

v3.0
  NEW FUNCTIONALITY
  - Added Run->Jump, which allows the user to quickly jump ahead to a
    particular tick without updating the display.
  - Added View->Goto to directly set the viewport coordinates.
  - Optional statusbar added to the bottom of the window: shows current tick,
    population count, status messages, and the coordinates of the point over
    which the mouse is hovering.

  COSMETIC/USABILITY IMPROVEMENTS
  - Menu items and toolbar buttons are now grayed out when appropriate.
  - Toolbar buttons added for reopen, cut, copy, and paste.
  - The items in the View->Zoom submenu are now radio buttons.
  - Dialogs are now centered relative to the main window.
  - In fullscreen mode, there's now a message reminding the user how to
    get back to windowed mode (if the statusbar is enabled).
  - You can now cancel out of a paste/move operation by hitting Ctrl-G.
  - Streamlined the Run->Speed dialog: the text box is selected by default,
    and you can complete the dialog by just hitting "enter" after typing a new
    speed.
  - The display no longer scrolls while pasting (it still scrolls while
    selecting or drawing).
  - The display scrolls faster when selecting.
  - Changed the Edit->Move keybinding from Alt-M to M.
  - Better user-error handling in Preferences.

  PATTERN COLLECTION CHANGES
  - Shifted jaws.lif around a little more.

  DOCUMENTATION IMPROVEMENTS
  - The help has been greatly improved.

  BUG FIXES
  - The fullscreen checkbox in the menu became incorrect if GtkLife started up
    in fullscreen mode then exited it. Fixed.

v2.2
  PATTERN COLLECTION CHANGES
  - Changed the offsets for jaws.lif, so that at least some of the pattern will
    appear onscreen after loading.

  DOCUMENTATION IMPROVEMENTS
  - Alan Hensel's notes on the Life Pattern Archive have been added to the
    help system.
  - Added a link to the Scientific American article on Conway's Life in the
    instructions.

  BUG FIXES
  - Fixed a logic error in the handling of oscillators, which could cause
    incorrect pattern evolution.

v2.1
  OPTIMIZATION
  - The Life algorithm now has oscillator detection: speed is significantly
    improved for patterns with large numbers of period-2 oscillators.

  COSMETIC/USABILITY IMPROVEMENTS
  - The Life display scrolls if you go off the edge while selecting, drawing,
    or pasting
  - Spinbutton sizes set more intelligently in various dialogs
  - No more pointless "help" button in color selection dialogs

  BUG FIXES
  - Major cut/paste bugfix: if you ran the pattern awhile then copied a block
    of cells, stable (still-life) cells would not be copied
  - Cutting and pasting now works properly even if you don't select from
    top-left to bottom-right
  - If you go off the edge while dragging the mouse, then release the mouse
    button, gtklife no longer gets confused.
  - Smoother drawing: no more dotted-line effect when dragging the mouse
    quickly
  - Spinning the mouse wheel no longer cause problems while pasting
  - No more mysterious disappearing selection
  - Population is now updated properly after cutting and pasting

v2.0
  NEW FUNCTIONALITY
  - Block cut and paste implemented (see help for details)
  - Fullscreen mode added (your window manager must support EWMH)

  COSMETIC/USABILITY IMPROVEMENTS
  - Mouse wheel scrolls the display vertically
  - Window size for View Description is chosen more intelligently
  - Keybindings added for Set Speed (Alt-S) and Preferences (P)
  - Help keybinding changed to F1
  - "Recenter" added to the "View" menu

  BUG FIXES
  - Fixed a corruption bug that could arise when drawing cells after running
    the pattern for awhile
  - The pattern no longer locks up when you try to set speed lower than the
    slider minimum

  DOCUMENTATION IMPROVEMENTS
  - Help file restructured

  MISCELLANEOUS
  - Better 48x48 icon
  - Massive code cleanup

v1.0
  COSMETIC/USABILITY IMPROVEMENTS
  - Colors for start and stop buttons have been switched
  - Most dialogs are no longer modal
  - The "save as" dialog now asks for confirmation before saving over an
    existing file
  - "Save as" and "open" dialogs no longer close after failed operations
  - The preferences, speed, and description dialogs now all have "Apply"
    buttons, to apply changes without exiting the dialog.
  - Several complex preferences can now be reset to their shipped defaults:
    patterns directory, colors, and help browser

  BUG FIXES
  - The default zoom level is now correctly displayed in preferences

  MISCELLANEOUS
  - Better code documentation

v0.04
  - Window title no longer shows the old filename after File->New

v0.03
  - The toolbar icons are now properly alpha-blended
  - Fixed a bug which caused graphic artifacts to appear after a speed change
  - The speed label is no longer truncated under certain GTK+ themes
  - Slightly friendlier Makefile
  - Added a version history in CHANGES

v0.02
  - The patterns collection is now included

v0.01 - First release
