Bug 7674: Separate items in two tabs on biblio detail page (staff+opac)

Bug 7674: Separate items in two tabs on biblio detail page (staff+opac)

Two tabs: "<branch> holdings" / "Other holdings"

"<branch> holdings" tab contains items whose homebranch is the current branch.
"Other holdings" tab contains all other items.

If current branch is not set (connected with mysql user or not logged in
(opac)), the display is unchanged (1 tab "Holdings")

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>