Apply suggestions from code review
Reduce max verification waiting time to 90 seconds
Also minor changes following peer review
Co-Authored-By: Chris Hill-Scott <me@quis.cc>
Use constants for notification status collections on verify reply-to
email address
Use a cleaner way of adding request arguments to url_for()
AJAX requests stop on success or failure, as the waiting page
does not have to referesh any longer.
Also on failure a form that allows user to try again
is shown.
