Cleanup and small improvements to libmv

- Added const modifiers where it makes sense and
  helps keep code safe.
- Reshuffled argument to match <inputs>,<outputs>
  convention on parameters.
- Pass values to ApplyRadialDistortionCameraIntrinsics
  by a constant reference.
  This will save lots of CPU ticks passing relatively
  heavy jet objects to this function when running
  bundle adjustment.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56769 954f8c5b-7b00-dc11-b283-0030488c597c