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always going to be required for imglab.

small window when the first image was bigger than the screen.

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

to change the label for a rectangle.

to/from the xml files.

--HG--
rename : tools/imglab/src/image_dataset_metadata.cpp => dlib/data_io/image_dataset_metadata.cpp
rename : tools/imglab/src/image_dataset_metadata.h => dlib/data_io/image_dataset_metadata.h

difficult, truncated, and occluded metadata fields of the pascal datasets.

--HG--
rename : tools/imglab/src/convert_pascal_voc.h => tools/imglab/src/convert_pascal_xml.h

--HG--
rename : tools/imglab/src/convert_pascal_voc.cpp => tools/imglab/src/convert_pascal_xml.cpp

imglab annotation format.