Changed how callbacks for interact_annotations are initialized, making it easier to extend.
Next and previous in interact_annotations now save changes.
There is now an option to preserve the MatPlotLib window when doing next/previous in interact_annotations (via the DESTROY_OLD_WINDOW flag in interact_annotations2.py). Requires a plottool pull.
Merge branch 'master' of https://github.com/Erotemic/ibeis