0.8.4.16

0.8.4.16
	More navel-gazing ...

	FIND-DEFINITION-SOURCE takes a thing and returns the source
	pathname and location at which it was defined.  Currently
	works for only a small number of things (simple functions
	and methods of gfs) and returns the location as the number
	of source forms from the start of the file.  Suspect that
	a character offset would be a better bet.

	Poor pretence for a test case added as well.  So far no
	framework to automate same.