[CM] Snd 15.2

[Bill Schottstaedt]

Snd 15.2

Mike Scholz fixed bugs in clm and the NetBSD audio code, and updated many of the scripts.
Anders Vinjar added lispworks code for gnuplot in dlocsig.lisp.

all the motif stuff (xm.c, snd-motif.scm etc) has moved to the *motif* environment,
  OpenGL (gl.c, snd-gl.scm) to *gl*, and gtk (xg.c, snd-gtk.scm etc) to *gtk*.

mus-copy (or copy) copies a generator.
added snd15.scm (old vct names)

checked: gtk 3.15.2|3, FC 21, sbcl 1.2.6

Thanks!: Mike Scholz, Matti Koskinen, Kjetil Matheussen, Anders Vinjar, Tito Latini