Bug 5079 - Make display of shelving location and call number in XSLT results controll...

Bug 5079 - Make display of shelving location and call number in XSLT results controlled by sysprefs

* Don't show the Location line if there are no copies available, since it
  will inevitably be blank

* Also, don't show locations for Checked Out, Lost, Damaged, Withdrawn,
  On Hold or In transit items; it doesn't really make sense, since the
  items aren't actually there, and it results in repetitive listing of
  the shelving location

* Added system preference to display shelving location of an item on opac
  results. The system preference is called OpacItemLocation. I also moved
  the call number to a new line called Location along with the shelving
  location if it is enabled.

To Test:
  1) Run database update script to add syspref.
  2) Set OpacItemLocation to show locations or collection codes on the
     opac-search page.

  If it is working you should see the shelving location of the item
  before the call number. Multiple home branch shelving locations
  are seperated by a pipe character ( i.e. '|' ).

Based on code by Elliot Davis <tdavis@uttyler.edu>

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Works as advertised.

Signed-off-by: Ed Veal <ed.veal@bywatersolutions.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>