* Fixed detection of the esd plugin.

  * Fixed detection of the esd plugin.
  * Fixed the ts plugin's input type detection.
  * Fixed the BadCursor error in the x11 and xvideo plugins. For real this
    time (unlike my 2001/08/03 fix :p).
  * Made the wall filter work a bit better. It now spawns a 3x2 mosaic,
    but this will eventually be configurable, � la `--filter wall:3x3'.