Bug 8644 [OPAC] jQueryUI CSS file should not contain customizations

Bug 8644 [OPAC] jQueryUI CSS file should not contain customizations

This patch moves jQueryUI customizations into the main CSS
file for the OPAC. In order to get the corrected
default version of jquery-ui.css I have upgraded all core
jQueryUI files.

Testers should look at examples of each of the various jQueryUI
widgets we use in the OPAC to confirm continued functinality: tabs
and datepickers.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>