0.8.12.16:

0.8.12.16:
	Fix BUG #334
	... do bookkeeping behind the user's back for
		effective-slot-defitions generated by the user
	... for :class slots, allocate a location and place it in the
		class' class-slot-cells;
	... for :class / :instance slots, set the slot-definition-class
		slot to the new class;
	... add minimal test for reasonable behaviour.