Fixed various problems with reports page that I forgot to update after the Group/Pipeline/Search related changes. Actually, these had not been updated much since ER1, apparently.

Made changes to store permission info on the Event objects themselves. This speeds up some searches by an order of magnitude with respect to guardian's get_objects_for_user.

Removed SimpleSearchFormWithSubclasses. The only thing that needed this was the gstlalcbc report page, and there is a simple workaround instead: just get a list of Event objects, and upcast them to CoincInspiralEvents. One wrinkle is that the matplotlib call 'fill_between' (which had given us that nice grey region on either side of the expected IFAR line) seems to hang now. I emailed Chad and commented this out.

Added some features to gstlalcbc_report (semi-adaptive mass bins, default query, end_time template filter). Also refactored gstlalcbc_report into reports.py. Some other cleaning up.