Bug 12528 - Enable staff to deny message setting access to patrons on the OPAC

Bug 12528 - Enable staff to deny message setting access to patrons on the OPAC

  - Change the preference Enhancedmessagingpreference description.
  - Enable default EnhancedMessagingPreferences and OPACEnhancedMessagingPreferences.
  - not sent e-mail it's necessary, when user call opac-messaging.pl directly..

Testing:

I Apply the patch
II Run updatedatabase.pl

0) Search OPACEnhancedMessagingPreferences preference;
1) Validate "OPACEnhancedMessagingPreferences show patron messaging
   setting on the OPAC (NOTE: EnhancedMessagingPreferences must be
   enabled).";

2) Disable OPACEnhancedMessagingPreferences preference;
3) Enable EnhancedMessagingPreferences preference;
4) On the OPAC -> user's settings, validate "your messaging" is not
   showed.

Signed-off-by: Frederic Demians <f.demians@tamil.fr>
  Works as expected. With the new syspref, patrons can be forbidden to
  modify themselves their own messaging preferences.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Also, I like sysprefs
http://www.quickmeme.com/img/d9/d99723bc544e8d33572dc92f242a6f6e2dbe0126a2e35fe3de073d30d62002e6.jpg

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>