plate2kml: Minor wording change
CameraBBox: Speed up by a factor of 20 per Zack

- Change the cost function when intersecting a DEM with a ray to avoid projecting into the camera which is expensive.

- Also consolidate some code I duplicated earlier.

- All tests are passing
CameraBBox: Nuke whitespace
plate2kml: This was renamed to plate2cloud, undo mistaken checkin
stereo: Use std::equal instead of IsEqualElements

Code reuse for the win! Hooray less code!