Bug 29194: Create logical ordering of patron messaging preferences

Bug 29194: Create logical ordering of patron messaging preferences

This patch introduces a default ordering for patron messaging preferences. The prefs are then sorted by this ordering before being displayed.

To test:
1) Visit a patrons detail page.
2) Note the message prefs aren't ordered (or rather sorted by 'message_attribute_id')
3) Apply patch, restart_all
4) Ensure they are now sorted in teh following fashion:
        'Hold_Filled'      => 1,
        'Hold_Reminder'    => 2,
        'Recall_Requested' => 3,
        'Recall_Waiting'   => 4,
        'Ill_ready'        => 5,
        'Ill_unavailable'  => 6,
        'Ill_update'       => 7,
        'Item_Checkout'    => 8,
        'Auto_Renewals'    => 9,
        'Advance_Notice'   => 10,
        'Item_Due'         => 11,
        'Item_Check_in'    => 12

Signed-off-by: Roman Dolny <roman.dolny@jezuici.pl>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Please note discussion on BZ about the preferred order ;)
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>