Version History

2.24	Renamed units.txt to rpnunits.txt to avoid a conflict with units.txt in ROM on the Velo.  Corrected problems with parsing very large (greater than 1E308) and very small (less than 1E-308) numbers.
2.23	Added status dropdowns and help to Windows CE version.
2.22	Corrected display bug on Windows CE handhelds with 640x240 screens.
2.21	Corrected conversion factor for litres.  Added support for Windows CE handhelds.

2.20	Added tags.
2.10	Added character strings.
1.80	Added local variables and programming structures.
1.70	Added complex numbers.
1.60	Added vectors.
1.40	Added unit objects.
1.20	Added lists and programs.
1.10	Added integers, matrices, and variables.
1.00	Original version with only real numbers.
