rotate_image_dataset().

the 2011 paper Introduction to dual decomposition for inference by David
Sontag, Amir Globerson, and Tommi Jaakkola since the original 2008 paper had an
error in the algorithm that negatively effected its convergence.  Thanks to
James Gunning for pointing this out.

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.