41CL use of EXCFG, RCLCFG and STOCFG

[Monte Dalrymple]

OK, so there are now 15 alternate configurations available: 1-9 and A-F. Seems
to be working in V41, but I haven't loaded it on a real CL yet. Soon, though.

Keeping track of this many configurations might be a challenge, so I was
wondering if there were a way to "name" them. What I came up with would
only be a substitute for RCLCFG, and the names would be hard-coded in
the IMDB. You would use the regular PLUG function to access the alias. So,
for example, PLUG 9MTH x would be aliased to RCLCFG 1. The page identifier
in the PLUG function would be ignored and the 9MTH entry in the IMDB would
have the number "1" in it that would be passed to the RCLCFG transparently.

I thought that the following might be useful:

9MTH for math
9ENG for engineering
9MNY for financial
9FUN for games
9AST for astronomy
9AVI for aviation
9CHM for chemistry
9MED for medicine
9MIL for military/government
9NAV for navigation
9PHS for physics
9HAK for hacker
9SUR for surveying

These would be the standard aliases, but you can always add more or modify
them if you wanted, although that makes your IMDB custom. The 9xxx entries
in the IMDB are currently unused except to hold the version information, so
this would be compatible. These IMDB entries would be marked as "not pluggable"
for backwards compatibility.

Any votes yes or no? Any comments? I reserve the right to say "sorry, can't
be done" if I can't find space or can't figure out how to do it.