add a few comments to header files to help explain image data structure
Fixes comments from previous commmit
Fix some warnings
addded few comments
fix comment style
addded few comments
Fix copy/paste bug in y4m2png help.

This outputs PNGs, not Y4Ms.
First commit of logging code
Cleanup trailing whitespace

Conflicts:
	unix/Makefile
dummy test using Check
mingw32 fix (by brooss)
update comments in state.h
first take and saving motion vectors
fix merge conflicts
take 2 of writing out motion vectors
Include <math.h> for M_PI.

We also need to define _USE_MATH_DEFINES on MSVC for the constants
to be visible.
patch from tim to make grid top level only
Add autotools build system
Add gitignore file
trying to get motioin predictionframe ready