Admin py stuff

Minor changes to some admin.py pages (mostly to the formstack app module).

(also deals with issue #1253)
Oh, I see, you said.  I'm not sure that it's much of a performance difference, especially since we're already doing a bunch of inexact lookups, and I could see doing it if someone might have entered their email wrong (e.g. to find someone who can't get their confirm email because they entered emailaddress@gmial.com).