CC41 RPN Calculator

[Craig Bladow]

v0.42.04_alpha can now be downloaded from the GitHub link in the first post.

Changes include:
Added WATCH, UNWATCH and CLWATCH commands that help program development and debugging by displaying register contents.
Fixed string not recognized when when a space character immediately followed a double quote.
Fixed LIST only displaying the first 4 characters of an alpha string in Windows only.
Updated Control Flags section in user manual to show user mode flag 27 as not reserved.
Added alias so '!=' is recognized as meaning not equals in addition to '<>'.