Notify the user on his account page when his account is almost expired

Notify the user on his account page when his account is almost expired

New feature : If the "NotifyBorrowerDeparture" system preference is defined, a
notification appears in the user's account page if his subscription is almost
expired.

http://bugs.koha-community.org/show_bug.cgi?id=6978
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
works perfectly with date formatted DD/MM/YYYY as well
(cherry picked from commit e676e117fccfaa8208742c17a08cb92056286f95)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>