case-table braindamage

[Stephen J. Turnbull]

Julian Bradfield writes:

 > After much tearing of hair, I read casetab.c carefully, and saw the
 > following bizarre fact:

*sigh*  casetab has always been an embarrassment.

 > Why? This behaviour seems utterly at odds with what one would expect
 > from functions called "set-", rather than "modify-".

I use ASCII and Japanese, the latter being caseless; I never encounter
odd behavior in the casetable code for that reason.  Maybe Aidan will
pick up on it, but if not, I'll try to take a look at it.  Suggestions
welcome (and patches even more so).