Bug 2394: Use syspref canreservefromotherbranches in CanItemBeReserved

Bug 2394: Use syspref canreservefromotherbranches in CanItemBeReserved

If IndependentBranches is ON, patrons are not allowed to place
hold requests on items whose owning library is different from
the patron's home library, *unless* the canreservefromotherbranches
system preference is also ON.

The patch implements the intended behavior; without it, IndependentBranches
and canreservefromotherbranches were not consulted during the
item holdability check.

To test:

[1] Have IndependentBranches ON and canreservefromotherbranches
    OFF.  Make sure that the circulation rules are set up to
    permit patrons to place hold requests in general.
[2] In the OPAC, log in as a patron from library A, and try placing
    a hold on an item from library B.  The patron will be able to
    place the request.
[3] Cancel the request.
[4] Apply the patch.
[5] Try placing the same hold request.  This time, the request should
    be forbidden.
[6] Turn on canreservefromotherbranches.
[7] Try placing the hold request.  This time, it should go through.
[8] Cancel the request.
[9] Turn off IndependentBranches.
[10] Try placing the hold request and verify that it is permitted.
[10]

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>