CC41 RPN Calculator

[Craig Bladow]

v0.45.00 alpha can now be downloaded from the GitHub link in the first post.

Changes include:
New command SAVEP which saves a program in memory to a text file in a format accceptable to utilities that convert text file programs into HP 41 RAW file format.
Some CC41 command names have been changed for compatibility with the converter utilities. The previous commands will also continue to be accepted.
When the program is listed or saved using SAVEP, the new commands will be used.
This name change mainly affected the statistics functions where 'sum' was replaced by 's' for those functions.
CC41 also now accepts '>' as the append text character, along with '+' and '|-' (but not inside double quotes).
SAVEP and LIST will output '>' preceding text that is to be appended to the alpha register.

New command EXEQ that can execute a system command, shell script or batch file. This can be used to call an external utility to convert the output of SAVEP so it can be loaded into a 41 compatible calculator or emulator. In the case of a USB connected, file system enabled, DM41X, the raw file can be copied directly to the calculator. Also EXEQ could be used to call another instance of CC41, sending data and state using existing commands and also reading the results. (See Namir's earlier request)
Tested with: https://dm41.swissmicros.com/ (Must manually change SAVEP append symbol '>' to '|-')
Tested with comp41 from lifutils https://github.com/bug400/lifutils
Tested with 41uc from https://sourceforge.net/projects/hp41uc/