Renamed RetainTransform to RetainMetadataTransform to avoid ambiguity with variance-related operations
Preliminary set design
Merge branch 'master' of https://github.com/biometrics/openbr into restrict_metadata

Conflicts:
	openbr/core/qtutils.cpp
	openbr/plugins/landmarks.cpp
Decoupled toQVariantList
Cleaned up stasm
Fixed string comparison
Merge pull request #118 from biometrics/decouple_variantlist

Decouple variantlist