Gaussian blur optimisation. It now runs without skipping images with default sigma (2.0) using my small sample video (352x240). This still needs to be optimised a lot.

New gaussian blur video filter. This currently takes way too much CPU. I'm not sure how it should be optimised. Maybe using floats instead of ints might work (if it can remove the need for a division).

no exception was passed

if it is NULL (memleak pointed by Pierre D'Herbemont)

gnome-vlc-default.sh is a script but i don't think it has anything to do in $PREFIX/bin and even less in $PREFIX/bin/application. so Put it in $PREFIX/share/vlc/utils

 * motion.c: reflect changes on rotate.c

Optimze nearest neighboor scaling implementation. This is used by the sub pictures core. CPU decrease compared to previous version with my test filter was: 66% for YUVA, 65% for I420 and 71% for RGBA.

Mostly patch by  Sergey Volk

Contrib: Attempt to repair .la pathes. Repeating things, because I don't know how to do it better... Anyway, just an attempt

- Put a limit on the SDP size
- Remove check for access_demux (this is not one, and it would crash later if it were anyway)
- Fix description to not assume this handles UDP only (since it does not anymore)