any object part labels so that the flipped dataset has the same average part
layout as the source dataset.  I added a --flip-basic that behaves like the old
--flip.  However, most people flipping a dataset with part annotations will
want to use --flip.

next using dlib::correlation_tracker.

histogram is equalized or unmodified.  This way, if you are looking at
particularly dark or badly contrasted images you can toggle this mode and maybe
get a better view of what you are labeling.

* Add option --rm-other-labels to imglab

* Add support for comma separated list of labels

it simply partitions the data and is an invertible operation.

image.

in the file names to make it so there won't ever be any name conflicts
in the cropped images.

now the output images are always the same dimensions but the objects scale changes.

totally removing it, and also made --stats print the number of non-ignored
boxes.