Simon's Prelude changes
			~~~~~~~~~~~~~~~~~~~~~~~

[The real commit preceded this, but had the stupid message "msg_prel"
 because I used "cvs commit -m" instead of "cvs commit -F"]

Prelude is split into more modules
	new are: PrelEnum, PrelShow, PrelNum
	removed: PrelBounded (all in PrelEnum now)
		 PrelEither  (all in PrelMaybe now)

There are also a lot of RULES, of course.