--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.