Blender Git Loki

Camera tracking: fixed for automatic keyframe selection

Previously GRIC wasn't working because of typo in getting vector
dimension which are vector-columns, not vector rows.

This implied some additional changes to make selector working nicer:

- lambda coefficients in GRIC were changed form natural to base-10,
otherwise sums of rho functions are much smaller than constant
part of GRIC.
This also seems to correlate with papers where log() usually means
base-10 logarithm.

- Limited correspondence ratio from top, which will give better
results because it usually means longer base line.

- Made logging more useful.