Bug 9479: The member notices page doesn't display dates in the syspref format

Bug 9479: The member notices page doesn't display dates in the syspref format

In order to let the KohaDates plugin display a datetime, this patch
modify this plugin.
Now it uses Koha::DateUtils instead of C4::Dates.

Test plan:
- check that the date format on the member notices page
  (members/notices.pl) is displayed according your syspref dateformat.
- check that existing dates are always in the good format (without the
  hours) e.g. acqui/histsearch.pl, acqui/basket.pl, etc.
- Modify your syspref and recheck the previous pages

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
This is a nice addition, and works according to the test plan. A nice
follow-up would be to create a system pref for formatting times
(12/24hr).

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Fixed a tab in notices.tt to make QA script happy.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>