0.8.5.2:

0.8.5.2:
	Large increase in entropy, only mitigated by the fact that we
	cover more of POSIX and I've added a test suite...
	... make SB-GROVEL accessors not cons quite so much while
		looking for the address of the thing they're referencing
	... add whole bundle of new functions in SB-POSIX...
	... which necessitates SAP-REF-64 and friends, which probably
		work everywhere except MIPS
	... declaim *GC-INHIBIT* as a fixnum, because if more than 2^29
		threads are inhibiting gc we probably have more problems
	... beginnings of a test suite for SB-POSIX, which incidentally
		shows up various problems with using it (see FIXME
		comments dotted around)
	... please feel free to fix any and all of the issues marked;
		I'm by no means claiming ownership of this :-)