Bug 15839: [QA Follow-up] Error checking in opac-review.pl

Bug 15839: [QA Follow-up] Error checking in opac-review.pl

[1] Adds a check on biblionumber. (Prevents a DBIx error.)
[2] If you have a reviewid, search on that and check results.
    Add an unauthorized error in template.
[3] If you add a new review, check that there is no review yet.
    If so, edit the existing one.
    This supports the added FIXME on a unique constraint.

Note: This script could receive further attention.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Tested all crud ops with opac-review.pl (incl URL manipulation).

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>