
plmkstrm: Creates a new stream and makes it the
default 

DESCRIPTION:

	Creates a new stream and makes it the default.	Differs from using
	plsstrm, in that a free stream number is found, and returned.
	Unfortunately, I have to start at stream 1 and work upward, since
	stream 0 is preallocated.  One of the big flaws in the PLplot API is
	that no initial, library-opening call is required.	So stream 0 must
	be preallocated, and there is no simple way of determining whether it
	is already in use or not. 

SYNOPSIS:

plmkstrm(p_strm)

ARGUMENTS:

    p_strm (PLINT *, output) :      Pointer to stream number of the created
        stream. 
