Bug 6598 [REVISED] OPACFineNoRenewals syspreference does not stop user renewing in...

Bug 6598 [REVISED] OPACFineNoRenewals syspreference does not stop user renewing in opac

This patch standardizes the condition under which renewal controls
are displayed at the page (as opposed to item) level. In some
places "canrenew" was used, in others "patron_flagged" was used.
Now "canrenew" controls renew controls and "patron_flagged" only
triggers the display of user warnings.

This patch also allows for renewal information to be displayed
for each item in situations where OPAC renewals are allowed but
disabled for whatever reason. This gives the patron information
about used/available renew counts but hides renew controls.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
(cherry picked from commit 0027fe0cc367632038f4562aaea22a582c785d9b)

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