Bug 21291: (follow-up) Pass subscriptionsnumber to all tools in staff detail's sidebar

Bug 21291: (follow-up) Pass subscriptionsnumber to all tools in staff detail's sidebar

The subscriptionsnumber is required in biblio-view-menu.inc to display
the Subscription(s) tab. In detail.pl, if you click any of

Labeled MARC  (you need to set the syspref viewLabeledMARC)
Hold(s)
Article requests
Checkout history
Modification log
Rota          (you need to set the syspref StockRotation)

you lose the Subscription(s) tab.

This patch fixes the display by having each feature script generate that
value to be passed to the UI. I keep this separated from the first patch
since it's not exactly the same issue, and the solution might not
please.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>