Trace control with trace subroutine calls

The controls for the trace routine are available as subroutines from the librts.a library.

The subroutines return zero on successful completion. The subroutines are:

int trcon()

Begins or resumes collection of trace data.

int trcoff()

Suspends collection of trace data.

int trcstop()

Stops collection of trace data and terminates the trace routine.