[CM] snd 6.4

[Bill Schottstaedt]

Snd 6.4:

inf-snd.el from Michael Scholz: fancy emacs support for Snd in Guile/Ruby.

v.rb and examp.rb improvements from Michael Scholz

plugins-menu.scm improvements from Dave Phillips.

control-click of mark's play triangle plays all chans from that point.

make-region chan arg = #t includes all chans following sync in the new region.

gtkglext bindings for gl.c

matching paren underlined in gtk listener (motif version already worked).

removed Chebyshev and Hankel transforms (a re-implementation in scheme
  is on my TODO list).

run macro in Snd now has full support for def-clm-struct.

new-sound-hook and sound-let (ws.scm).

init-func arg added to ptree-channel, implementing closures for
  these virtual edits.

sndlib configuration process now writes libsndlib.a and .so,
  installs a script named sndlib-config.  Snd's configure
  script has the matching --with-shared-sndlib switch.

checked: Ruby 1.6.8 (Nov 18 version).
         Autoconf 2.56

with much help from: Dave Phillips, Fernando Lopez-Lezcano,
  Michael Scholz, Claus Brunzema, Judy Hawkins, Michael Klingbeil,
  David Friedman