Bug 10247: show warning if hold blocked due to maxreserves syspre

Bug 10247: show warning if hold blocked due to maxreserves syspre

On intranet, when placing a hold requst:
If borrower has reached the request limit, a warning should appear :
  Cannot place hold
  * Too Many Holds: TEST has too many holds.

This works when quota defined in circulation rules is reached but not
when limit specified in syspref maxreserves is reached, in case this
limit is lower than the one defined is circulation rules.

This is because template param maxreserves is set twice, this patch
corrects this bug.

Also moves warnings and messages conditional variable from Perl to
template because it cause the same bug as for maxreserves.

Signed-off-by: Srdjan <srdjan@catalyst.net.nz>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>