Don't crash on messed up aspect ratios

Use DIR_SEP instead of "/"

 Patch to force alignment in OpenGL if it isn't correctlt positionned before, as panoramix does do it correctly. Patch By Cedric Cocquebert.

Don't allow negative offsets when blending subpictures

applied Westacular's patch with minor modifications, which solves some issues with this script in certain situations and lets the Finder do most of the work. Note that this script isn't 10.2-save anymore and triggers the Finder to launch in case that it is closed.

  small isolated feature. Enables H264 playback in apple's special RTP style

Do not assume long integers are 32-bits.
Should fix fullscreen on amd64

* revert Pierre's fixes for 0.8.6b, as they aren't 10.3.9 compatible without further configure/makefile changes

* fixed ffmpeg's configure options and set the approbiate svn revisions for x264 (604) and libmatroska/libebml (1254)

* limit ffmpeg to revision 7400 to match 0.8.6a and prevent potential compatiblity issue. needs a bit of further testing

Closes #1031
It's probably unrealistic to fix this completely within the 0.8.6 branch