More informative error message when teacher bio is not found
Adds in time filtering stuff (and visible times) for records
Formstack admin.py stuff.

Now with searching and filtering.
Adds by-programming filtering for StudentRegistrations

(now, if I could mass expire them, that'd be *great*. But mumble mailman)
Adds email searching as well
Oh wait, the studentregistration bulk thing already exists and I am just
an idiot.

(it now has a message attached to it.)
Switches some search fields (for emails) for exact emails.

Because the django docs says something about better performance, and I
can't see why you'd want to search for a user's partial email....
more list_filter stuff
Adding this so all attempts to search for a user *should* behave
similarly
Adds usersearch for financial aid grants
Standardizes searching for users
Moves formstack stuff to default_search_fields
Guys guys guys this really needs a CHOICES
In the time it took me to do this, I probably could have added choices,
but see one yak
Adds id to default search fields
Adds created_by and modified_by to list_display for class flags
Switches Class Flags to default search fields

(and fixes #1264)
Adds the option to completely hide your teacher bio
More admin.py filtering and searching, this time aimed at volunteers
Begins adding CHOICES to ClassSubject and ClassSection

see issue #1263