TODO


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- Handle floating point exceptions, e.g. div by zero. See
  https://wiki.sei.cmu.edu/confluence/display/c/FLP03-C.+Detect+and+handle+floating-point+errors
  and man pages fetestexcept(3) and math_error(7).
- On startup, the value is read from the config file... but it can't
  be used as an argument to a binary op (only a unary one) if it's
  more than one digit. Except sometimes it can. Investigate and fix.
- Cleaner way of switching window sizes at runtime.
- Better handling of divide-by-zero (why an f? why not e for error?)
- Reindent the code (it's a confusing mess of tabs and spaces), and
  reformat it to my personal style.
- Make it play nicer with tiling WMs. If possible, anyway: echinus
  doesn't try to tile it (which is correct, since it won't resize).
  Try some others. Low priority.

- Long range possibility: rewrite the display/input stuff to use SDL2,
  so we can scale arbitrarily. Probably this would mean it'd work on
  Wayland too, though I don't much care about that.

- Find a real TI Programmer II calculator somewhere and compare.
  Probably there's room for a more accurate (si|e)mulation.