GNU units NEWS - User visible changes.
Copyright (C) 1996, 1997, 1999-2007, 2010-2013 Free Software Foundation, Inc.

Version 2.02 

* Added support for %a and %A output formats (hexadecimal floating point), and
  eliminated the restriction on the number of displayed digits when specifying
  an output format with the --output-format (-o) option.  Improved error
  handling for formats specified with --output-format.  
* Added --digits (-d) to specify the number of digits to display.  Giving
  '--digits max' (-dmax) will use the full available precision.
* Added support for various Unicode minus sign symbols.  Units now treats the
  figure dash (U+2012), the en dash (U+2013), and the minus (U+2212) as
  identical to the ASCII hyphen/minus symbol (U+002D).  
* The !message command in units data files has been fixed so it does not
  produce output when the --quiet option is given.
* Improved error handling when unit names end with numbers without a '_'.  
* Removed six unicode entries from definition.units that were flagged as
  invalid under MacOS.  
* Modified units_cur to work with XML format as the txt format disappeared.
* Corrected error in definition of the nat.  
* Improved manual.

Version 2.01 - 24 October 2012 (bug fix release)

* Fixed error in electronmass
* New definition for au
* Fixed DESTDIR support for installation
* Changed configure script for success with Solaris
* Small changes to manual

Version 2.00 - 6 June 2012

General changes:
* Unit lists provide conversion to sums of units (e.g. feet and inches).
* Added --round (-r) and --show-factor (-S) options for use with unit lists.
* Added unit lists aliases (e.g. time, usvol).
* A python script, units_cur, can update currency data.
* Units now flushes its output so you can talk to it with a pipe. 
* Units now works in UTF-8 if the system supports it.  
* Added --locale (-l) option to set the locale.
* English units such as the gallon are defined in all locales, with US
  definitions by default except in the en_BG locale.  You can force
  the desired definition (Great Britain or US) by setting the
  environment variable UNITS_ENGLISH to GB or US.  
* Revised and extended the documentation, with more examples. 
* Added locale mapping to address Windows locale names. 
* Updated and revised units database, including UTF-8 definitions and
  the 2010 CODATA. 
* Fixed parsing bug for "1..2" or "1.2.3".  These now give an error. 
* Unit names can end with a number in the form of a subscript that
  starts with a '_', as in 'X_3'.  
* Units now performs error checking on the printf format specified with the
  --output-format (-o) option.  

Changes for units definition files:
* Changed location and names of unit database, splitting off currency
  Files are /usr/local/share/units/{definitions,currency}.units and
  the personal units file is $HOME/.units instead of $HOME/units.dat.  
  (Under windows personal unit file is unitdef.units.) 
* Personal units filename can be changed with MYUNITSFILE environment variable.
* Prefixes can be defined in any order: it is no longer necessary to
  define longer ones before shorter ones.  
* New definitions replace previous ones.  Personal units file is read
  after the system file rather than before.  
* Changed syntax for function definitions.  Instead of [in-unit,out-unit] 
  you must now write units=[in-unit,out-unit].  Use 'units -c' to find
  places in your personal data files that need to be updated.  
* Add optional domain and range to function definitions with syntax
  domain=[min,max] and range=[min,max].  Either min or max can be
  omitted to signal infinity. 
* Unit list aliases can be defined with !unitlist command.
* Added !var and !varnot and !endvar to include definitions based on
  environment variable settings.  
* Added !set to set environment variables (if they aren't already set).
* Added !message to display a message
* Data files are in UTF-8, with !utf8 and !endutf8 commands to mark
  definitions that require UTF-8 support. 
* Improved error handling when reading units.dat.

Version 1.88 - 15 Feb 2010

* Updated units.dat
* Fixed bug involving readline version 4.2

Version 1.87 - 25 Sep 2007

* Units reads ~/.units.dat if it exists before reading the standard
  units database.  
* Added support for ** as an exponent operator.
* Type 'search text' to list units that contain 'text' in their name.
* Precedence of '*' changed to match precedence of '/'.
  (Multiplication by juxtaposition retains a higher precedence than
  '/'.)  The --oldstar option selects the old precedence and --newstar
  forces the new precedence.  

Version 1.86 - 10 Nov 2006

* Added --one-line (-1) option which causes the program to print only
  one line of output. 
* Added --compact option which causes the program to print only the
  conversion factors and a newline on output.
* Added build support for DESTDIR.
* Made minor changes that allow the program to be compiled into a
  library and linked with other programs.
* Fixed bug that caused bus error on Intel Mac.

Version 1.85 - 20 May 2005

* The '-' character by default indicates subtraction.  Multiplication can be
  obtained by '*' or ' '.  The --product (-p) option selects the old behavior
  where '-' acts as a multiplication operator.  The --minus (-m) option forces
  the default behavior where '-' indicates subtraction.
* Handing of radian and steradian changed.  These units are now treated as
  conformable with 1 for units conversions.  This is indicated by the
  "!dimensionless" tag in units.dat.
* Unit files can be included using !include.
* Multiple -f (--file) options can appear on the command line; giving
  a null filename (-f '') causes the default units database to be loaded.
* Added -t (--terse) option.
* Improved error checking for units.dat. 
* Corrected and extended units.dat.  


Version 1.81 - October 28, 2002

* Fixed missing definition of "au" in units.dat.  


Version 1.80 - June 16, 2002

* Rewritten parser supports 
  - () for grouping
  - noninteger powers of numbers (e.g. 3^0.25)
  - functions with dimensionless arguments (log, ln, log2, sin, cos, tan, exp)
  - roots of units: sqrt(unit), cuberoot(unit), and higher roots as unit^(1|4)
* Functions can be defined in units.dat, and conversion to a function
  performed by specifying the function name alone as the "want" item. 
* Unit conversions can be specified as tables with linear interpolation. 
* The "help" command summarizes operations, and "help unit" browses the units
  database at the definition of the specified unit.  
* Specifying "?" for the want unit gets a list of all conformable units.  
* Support for locales added.  
* Units file extended and corrected.


Version 1.55 - July 30, 1999

* Added over 600 new units and corrected errors in the units data file.
* Minor bug fix affecting unit name completion.


Version 1.54 - July 15, 1997

* Switched order of prefix and plural handling (plurals are now done first)
* Added reciprocal unit conversion and --strict (-s) option
* Fixed some erroneous unit definitions, added currency codes and other units
* Improved Makefile (exec-prefix, program-transform-name supported)
* Bug fixes


Version 1.53 - Jan 13, 1997

* Added units containing ISO 8859-1 characters
* Bug fixes 


Version 1.52 - Dec 18, 1996

* Sums of conformable units 
* Printing of unit definitions 
* Unitname completion with readline
* Added --verbose (-v) option and moved --version to -V
* Improved portability, old style C support, improved Makefile
