Avidemux 2.5.6

*Restored AC3 and MP2 encoding (regression introduced 2.5.5)
*Added support for latest x264 core
*Better compatibility with some FLV files
*Updated the FFmpeg libraries (version 0.9)
*Drag-and-drop no longer blocks source application for Qt interface
*Resolved Windows XP 32-bit stability issues (regression introduced 2.5.5)
*Windows 7 taskbar now displays encoding progress
*Improved crash reporting on Windows especially Win64
*Compilation fixes for OS X Snow Leopard and Lion (thanks to nibbles)
*Various minor fixes and enhancements