0.7.13.pcl-class.5

0.7.13.pcl-class.5
	Fix up SB-PCL exports
	... go through AMOP and make sure they agree, and add basic
		consistency check.

Aargh, did I say "no regressions"?  It looks like the CONDITION-CLASS
stuff broke defining classes with STRUCTURE-CLASS as a metaclass :-(
Hunting now...