[273,17]	This is updates to DECUS C [5,7]: RSX exec calls.
		I only made the ones I need: I suspect someone
		else has done all of them. All these are OK for
		I/D tasks.

FEATURE.C	Tests gin(). Shows what features an exec supports.

GIN.MAC		Allows structured crashes of RSX.

GMCR.MAC	Total re-write! (Previous version could never work).

SFUIC.C		Test gin() SFUIC$ function.

TASK.C		Test gin() SFFTK$ fuction: give details of own task.

VSDA.MAC	Invented.

VRCS.MAC	Invented.

VSRC.MAC	Invented.
