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in color instead of always converting to grayscale.

auto label boxes.  It will also auto-skip empty images when you hold ctrl.

to change the label for a rectangle.

#include statements to reflect this move.

--HG--
rename : tools/python/src/boost_python_utils.h => dlib/python/boost_python_utils.h
rename : tools/python/src/pyassert.h => dlib/python/pyassert.h
rename : tools/python/src/serialize_pickle.h => dlib/python/serialize_pickle.h

non-negative weight learning support.

most vectors

for other cross validation functions.