* ./src/misc/variables.c: callbacks are now called after the variable has

  * ./src/misc/variables.c: callbacks are now called after the variable has
    been modified. Maybe we'll need the other type, too, but this change will
    make things simpler in aout3.

  * ./src/playlist/playlist.c: removed two unused variables.
  * ./src/misc/modules.c: removed a debug message I had forgotten.
  * ./src/misc/modules_plugin.h.in: fixed a typo (thanks bozo).