HTML pages are a little smaller.

--HG--
rename : examples/krr_classification_ex.cpp => examples/using_custom_kernels_ex.cpp

--HG--
rename : dlib/test/hash.cpp => dlib/test/kmeans.cpp

cross_validate_trainer_threaded() is executing.

various save_*() calls for saving images.

are saved to disk by the various save_*() functions.

the target pixel was an RGB pixel with an alpha channel.