made during object detection.

changed the interfaces to these functions slightly.  Instead of taking a double that
determines how we decide if boxes match, they now take a test_box_overlap object.

Also added overlaps_any_box().

defaults to using exactly the PASCAL VOC match criterion.

rectangles instead of just one.

in each image.

rectangles.

to/from the xml files.

multiple object detectors.

the fhog_filterbank each time the detector executes.

so they can run each binary trainer on a different core.

by reference since this causes problems if the probabilistic adapter
is saved for later use.  Now it will simply hold the trainer by value.

#include dlib/svm_threaded.h instead of dlib/svm.h to get it now.

online reference.

integer ranges rather than just long ranges.

with the size of the filters being applied.