- Introduces a new mode structure for decomb, to make more flexible combinations...

- Introduces a new mode structure for decomb, to make more flexible combinations of options possible, as well as a debug mode that overlays the combing mask on the output. A full explanation of the new modes can be found at the top of libhb/decomb.c. The new default parameter string is: 7:2:6:9:80:16:16:10:20:20:4:2:50:24:1
- Cleans up some compiler warnings for decomb.
- Partially fixes mcdeint in decomb. I would not suggest using it yet, but it's getting piped the right data, it no longer outstrides its memory, and lavc finally fixed their Snow bug that broke iterative ME). Seems to work well on fully interlaced material, with the spatial metric (2nd paramter) set to -1. Output with hybrid material and when actually decombing is...poor, but these are, hopefully, surmountable problems.
- Lays some groundwork for bobbing.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@2685 b64f7644-9d1e-0410-96f1-a4d463321fa5