delta_seconds

	seconds.r4.v = delta_seconds(start.s.r, end.s.r)

	This function returns the difference between two VMS binary
	(quadword) times, expressed in seconds.

	start		starting time in VMS time (quadword) format
			(datatype VMS_TIME)
	end		ending time in VMS time (quadword) format
			(datatype VMS_TIME)

	This function returns 0.0 seconds if it has any problems.

	This function requires the following include files:

	clib_h, cns_data_structs_h