The queued email gets deleted if the user signs up before it gets sent.
Otherwise, they are reminded in 2 days that they still haven't signed up.
This addressses Trac #1812
(imported from commit c1bdc09c03ac576b08986e56994de72d52fd293b)
Handled by the queue processor for signups. Added a management command
that accomplishes the same task, in case it's needed for manually added users,
or in case we goof and need to remove queued emails for a given user.
This addresses Trac #1807
(imported from commit 6727b82a07fa6a3ea3d827860c9e60fd0602297a)
Jessica McKellar
acrefoot