Bug 11169: Display acquisition details in the OPAC

Bug 11169: Display acquisition details in the OPAC

This patch adds a new system preference 'OPACAcquisitionDetail'.
If it is enabled, information about items on order will be displayed on
the OPAC detail page.

Test plan:
- switch on the OPACAcquisitionDetails pref.
- set the AcqCreateItems pref to 'receiving'.
- create some orders on 1 or more items.
- go to the opac detail page and verify the "Holdings" tab contains the
  line "X item are on order." (at the bottom of the table containing the
  item list).
- receive the items.
- verify the number of items has decreased.
- set the AcqCreateItems pref to 'ordering'.
- create some orders on 1 or more items.
- go to the opac detail page and verify the item list contains the items
  with the "on order" status.
- receive the items.
- verify the received items no longer have the the "on order" status.

To test completely this feature, you should verify there is no
regression on the pref OpacMaxItemsToDisplay, OpacSeparateHoldings and
OpacSeparateHoldingsBranch.

Signed-off-by: Paola Rossi <paola.rossi@cineca.it>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Also removed some blank lines from the original patch and bumped up
the DBRev.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>