bug 5045 - Help works even when the referrer is being stripped

bug 5045 - Help works even when the referrer is being stripped

This fix puts the URL of the source page as a parameter to help.pl,
which will override the referrer value, if it's provided. This deals
with people sitting behind proxies that strip the referrer information
out.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit 980de26320d7dc389a0faf88d341f3dc373dd831)

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