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always going to be required for imglab.

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

to change the label for a rectangle.

--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

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

imglab annotation format.

the XSLT stylesheet file is always created in the same directory as the
main XML metadata file.