Bug 13782: RSS for news needs a bit of styling

Bug 13782: RSS for news needs a bit of styling

This patch makes a number of updates to the display of news in the OPAC.
I hope that this makes OPAC news nicer/easier to read. It includes style
changes to make the RSS link look better too.

To test, apply the patch and regenerate the OPAC CSS. You should have
multiple active news items. View the OPAC news with varied values of
NewsAuthorDisplay and OpacNewsLibrarySelect.

Test the single news item view. Test with Quotes on and off, and with
OpacMainUserBlock populated or not.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>