Notes for Lockwood Morris's enumerated finite sets/maps library.
Latest updates to enumfset code (from Lockwood Morris).

Builds on master.
Modify Description to use holtexbasic and underscore packages.

This seems to require reference/label names to not include
underscores, so a bunch of changes were made in that vein.  Using
holtexbasic is a prerequisite for eventually converting to using
EmitTeX technology.
Include preliminary documentation for enumfset library.
Move help-system code into interactive system only (Poly).