Bug 22478: Prevent XSS vulnerabilities when pagination appears

Bug 22478: Prevent XSS vulnerabilities when pagination appears

This is a bad one as we thought we were XSS safe since bug 13618.

The html code generated in C4::Output::pagination_bar must escape the
variables and values correctly.

This patch needs to be widely tested, everywhere the pagination appears,
to make sure we will not introduce regressions.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>