Bug 21137: Replace USER_INFO with logged_in_user

Bug 21137: Replace USER_INFO with logged_in_user

This patch set does several things:
- it removes USER_INFO and BORROWER_INFO
These 2 variables contained logged-in patron's info. They must be
accessed from logged_in_user
- Use patron-title.inc for the breadcrumb at the OPAC, for consistencies

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>