code cleanup: camera tracking

- Moved keyframes and refirement flags into reconstruction options structure
- Moved distortion coefficients and other camera intrinsics into own structure
- Cleaned up reconstruction functions in libmv c-api

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svn merge -r52853:52854 ^/branches/soc-2011-tomato



git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54840 954f8c5b-7b00-dc11-b283-0030488c597c