More extensive testing, exotic channel config, feedback on other platforms

Optimize for mono and stereo special cases
  - i tried this, and I couldn't do better than -O3 -march=pentium4
  - someone else can try their hand, but beware.

Cool FXRuby GUI with SOX

Hopefully usable Winamp plugin before next version.  Yay!

Rememember: when updating version, change in docs, readme, and vlevel-bin.cpp
