[CM] sndlib additions

[Bill Schottstaedt]

I added all the non-Snd-specific instrument files to the sndlib tarball:
  analog-filter.scm|rb, animals.scm, bird.scm|rb|fsm, clm.fs, clm-ins.scm|rb|fs, 
  dlocsig.scm|rb, fade.scm, freeverb.scm|rb, generators.scm, grani.scm, jcrev.scm, jcvoi.scm,
  maraca.scm|rb, maxf.scm|rb, moog.scm, noise.scm|rb, piano.scm|rb, prc95.scm|rb,
  pvoc.scm|rb, singer.scm|rb, sndwarp.scm, spectr.scm|rb|fs, stochastic.scm, 
  strad.scm|rb, v.scm|rb.  

New files: expandn.scm, fullmix.scm, and nrev.scm from clm-ins.scm.