Peter M. Groen / openbr

Conflicts:
	openbr/plugins/tree.cpp

This reverts commit decda7bc5277e839d1bcf3e78754f2400878c969.

This reverts commit cb35ce836903f6baa19cf577932e6d2b92f3fedb, reversing
changes made to f2f88b8c72d0c86d66232c2cb26a39ab40bca4f3.

Eigenutil cleanup

Eval landmark improvements

Conflicts:
	openbr/core/eval.cpp

Switch FaceRecognition to UnitDistance instead of
MatchProbability--there are some doubts about using gaussians to model
the score distributions, and the KDE code is untested.

Remove FTETransform from age/gender classification (again, it is
unused). Drop a couple extraneous Expands.

Parallelize KDE lookup table building, also introduce a flag, and
don't do KDE training at all, if Gaussians will instead be used to
model the score distributions

Also address an issue with retraining algorithms, using pre-trained
submodules

Error message for ReadTransform

Implemented RndSample transform