Attempt to save the last dregs of emacs users' sanity by saving the
contents of the PR when an interrupt is received during the editor
session.  This stops the use of ^G from deleting a filled PR from
underneath the user.

PR:			bin/[[ https://bugs.freebsd.org/59201 | 59201 ]]
Submitted by:	Heikki Suonsivu <hsu@evoluutio.bbnetworks.net>