Bug 7636 - error when trying to email cart when opacuserlogin set to don't allow

Bug 7636 - error when trying to email cart when opacuserlogin set to don't allow

This patch hides the "send cart" link if the opacuserlogin
preference is set to disallow. Other similar changes included:

- hide the "send list" link
- hide the "your lists" tab
- hide the "log in to create your own lists" link
- hide the "recent comments" link

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Tested with opacuserlogin set to both "Allow" and "Don't allow." With
opacuserlogin set to "Allow," the links showed up, and with opacuserlogin
set to "Don't allow," the links did not.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>