fist KL and approximation computation on covariance matrix in between two steps
added divergence on sigma to compare with KL elements + fixed determinants, not tailored for performance
Merge branch 'kl' into nn_ex

Conflicts:
	src/cmaparameters.h
	src/cmasolutions.h
	src/cmastrategy.cc
	src/cmastrategy.h
	tests/test-functions.cc
added support for mahalanobis distance computation + new drop dimension scheme in mnist example