Fix some memory leaks on filter descrtuction

git-svn-id: http://vapoursynth.googlecode.com/svn/trunk@494 f9120d27-2007-6f97-8312-0f4ebfa7710f
remove some unnecessary vapoursynth. prefixing

git-svn-id: http://vapoursynth.googlecode.com/svn/trunk@495 f9120d27-2007-6f97-8312-0f4ebfa7710f
Add clip.set_output() to python, untested

git-svn-id: http://vapoursynth.googlecode.com/svn/trunk@496 f9120d27-2007-6f97-8312-0f4ebfa7710f
Change things around for no real reason

git-svn-id: http://vapoursynth.googlecode.com/svn/trunk@497 f9120d27-2007-6f97-8312-0f4ebfa7710f
Change the cache so it doesn't always keep one frame around, prevents out of memory errors in scripts with far too many caches inserted because of trim/splice

git-svn-id: http://vapoursynth.googlecode.com/svn/trunk@498 f9120d27-2007-6f97-8312-0f4ebfa7710f