Bug 7567 - Use, display, filter News by library

Bug 7567 - Use, display, filter News by library

This adds the ability to specify whether staff, OPAC,
or slip news entries apply to all libraries or just a
particular library.

With the branch parameter added to key functions in
C4/NewsChannels.pm, function calls in C4/Members.pm,
mainpage.pl, opac/opac-main.pl, tools/koha-news.pl, and
t/db_dependent/NewsChannels.t were needed.

Some license texts were updated.

Templates were modified to display, allow for entry and editing
of the branches selected.

TEST PLAN
---------
1) Having logged into the staff client, is the news displaying
   correctly? Have you entered a news item which should not
   display for this branch of logged in user?
2) Find a patron (with some items checked out?)
3) Print a slip
   - News which is labelled 'All Branches' or for the same branch
     as the one printing the slip should display on the slip.
   - THIS DOES NOT AFFECT QUICK SLIPS
4) Home -> Tools -> News
   - Can you edit a news item?
   - Does the change save correctly?
   - Can you filter based on location and branch correctly?
   - Can you add a new entry correctly?
   - Can you delete an entry correctly?
5) Open an OPAC client.
   - Does only the news for all branches display?
6) Log into the OPAC client.
   - Does the news for all branches and the specific branch display?
7) prove -v t/db_dependent/NewsChannels.t
   - Does it run and all succeed?
   - Does the code seem to catch the required cases?
8) Comparing the patched and unpatched versions of files affected,
   are the license changes missing anything?

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>