bug 2893: tweaks to AllowNotForLoanOverride (DB rev 030)
* moved to DB rev 030
* assigned AllowNotForLoanOverride to circulation syspref category
* added a hint to the circulation operator: when the
AllowNotForLoanOverride is ON, if the operator attempts
to check out an item that is normally not for loan due to
its item type or because the item is explicitly marked as
not-for-loan, the operator is given the chance to check
out the item anyway.
Signed-off-by: Galen Charlton <galen.charlton@liblime.com>