[CM] snd 6.5

[Bill Schottstaedt]

Snd 6.5:

  inf-snd.el and examp.rb improvements from Michael Scholz (including
    a translation of nb.scm)

  virtual ops extended to cover more envelopes and channel swap cases
  xramp-channel underlying exponential envs as virtual ops
  new last arg to ptree-channel to fallback on a general evaluation
    as the virtual op -- anything as a virtual op, but not very fast
  orientation-hook and color-hook.
  start/stop-waterfall in snd-gl.scm (OpenGL "waterfall" spectrum of
    incoming audio data).
  loop-samples and c-channel removed.
  channel-amp-envs now returns vcts, not vectors.
  added various simple FIR filters to dsp.scm.
  added remove-local-hook! (hooks.scm)

  Paul Kirk figured out how to get CLM to compile/load in ACL 6.2 in Windows.
  Larry Troxler contributed CMN accidental fixup code.

Checked: Guile 1.6.1
         gmeteor-0.93
	 gtkglext-0.6.0
         final Ruby 1.6.8 and preview 1.8.0
         gtk 2.2
         gsl 1.3
	 autoconf 2.57

With much help from: Dave Phillips, Michael Scholz, Paul Kirk, Larry
  Troxler, Stefan Schwandter