Major cleanup of codebase (removal of unnecessary cruft).

Any time you can throw away code is a good time; we've had a very good
time lately. :-) Mainly removed redundant structures that were bolted on
to the codebase, most likely by persons who didn't have the slightest
clue how the thing worked. That's gone now, and hopefully from here on
out, things will start to get *much* cleaner.