[CM] snd 7.8

[Bill Schottstaedt]

Snd 7.8:

new version of gfm package (sndlib/gfm) thanks to Mike Scholz,
   now included (along with sndins) in the Snd tarball.
   also many other improvements

various bugfixes and improvements thanks to Kjetil S. Matheussen

added:
   recorder-in-chans
   vct->string
   normalize-channel
   controls->channel
   sound-data->sound-data (for oscope)
   rms-envelope in env.scm (based on Bret Battey's rmsenv.ins)
   edit history pane popup menu (popup.scm and gtk-popup.scm) (unfinished)

   oscope.scm: oscilloscope dialog

removed:
   track-id arg to mix-selection
   edpos arg to play-selection
   mus_audio_save|restore (audio.c) and Scheme/Ruby correlates
   the dumb buttons at the bottom of the controls (Apply etc)
     these are now in various popup menus

moved scale-sound-by and scale-sound-to to snd7.scm.

changed handling of recorder-out-chans -- it now sets the max out chans
   displayed in the recorder dialog, as well as the default output file chans.

checked: gtk 2.5.4|5, sbcl 0.8.16, ruby 1.8.2-preview3

with much help from: Mike Scholz, Heinrich Gudenus, Kjetil S. Matheussen,
   Dave Phillips, Michal Seta, Thomas F. Bechteler, Frank Barknecht, Peter Lutek,
   Tim Orford, Juan Reyes