Merged changes from omxplayer to revision 2677e25fbec319da1b9e5e1fa15eebc178bf40d6 of Fri Apr 26 03:14:54 2013 -0700. This requires new ffmpeg libraries (use the script to rebuild the correct version). Also, this reuires a recent Pi firmware, at least 384946 so that float audio is supported. Also built procedure has changed: add either CONFIG_LIB or CONFIG_APP to the qmake line to select the build mode.