Imported from archive.

* bin/muff, lib/muff: Replaced the embedded license copies with
pointers to the LICENSE file. Added lots of in-line code commentary
and docstrings. Refactored some blocks of code for improved
readability.

* bin/muff, etc/mudpy.conf: Moved to the top-level directory.

* doc/license: Renamed to LICENSE and moved it to the top-level
directory.

* lib/muff/muffcmds.py (command_null): Removed.
(command_say): Additional output cleanup.

* lib/muff/muffmain.py (main): More robust handling for variable
files.

* lib/muff/muffmisc.py (wrap_ansi_text): Minor word-wrapping fix.
(User.__init__): Added tracking of last login address.