languages other than (module ...)
made push-pull-ball not a module, so it just runs in FrTime
removed velocity display from pong.ss, and moved default location of left
controller so it doesn't cause div-by-zero exceptions
svn: r3718
compiler/garbage collector
- fixed div by zero bug in pong.ss demo
- removed defunct net-pong demos and ft-spread
- added documentation and demo sheet for spreadsheet
svn: r3329