* There are now Reports and ReportRecords.
* Reports coordinate to what moderators see, and ReportRecords
coordinate with the reports that are created by individual users.
* Reports keep track of the report reason and the creating user.
* ReportRecords keep track of the total weight and whether this report
requires urgent attention or not.
* ReportRecord keeps track of its own weight and urgency because then we
can sort by weight and urgency in the admin view.
Signed-off-by: Alek Ratzloff <alekratz@gmail.com>