0.9.15.17:

0.9.15.17:
	Implement the :FUNCTION initarg for method initialization
	... half of the battle here was altering the propagation of
		information about methods around the system.  Prior
		to this checkin, information was kept in a (non-weak)
		hash table holding plists for method functions and
		method fast functions.  Instead, we associate the
		plist with the method itself.
	... implement method-qualifiers as a proper slot reader, rather
		than through the plist;
	... method-function-get-DIE-DIE-DIE
	... constant-method-call and constant-fast-method-call
		structures for the special case of constant-value
		(e.g. predicate) generic functions
	... remove :METHOD-SPEC initarg, since it's useless
	... rely more on interning instead of METHOD-FUNCTION-PV-TABLE
	... remove dead code (e.g. METHOD-FUNCTION-CLOSURE-GENERATOR,
		MAKE-INTERNAL-READER-METHOD-FUNCTION)
	... define a %METHOD-FUNCTION funcallable structure, to bind
		function and fast-function closely together.
	... remove the :FAST-FUNCTION initarg.  Now, if the system wants
		a fast-function, it creates a %method-function structure
		with the fast-function in the fast-function slot (and
		an ordinary method-function as the
		funcallable-instance-function)
	... some test cases.  (This fixes bug #361 among others, and we
		have no current failures against the Closer
		mop-feature-tests)