webstaff: Book Items Now from Item Status

webstaff: Book Items Now from Item Status

FIXME

We can't do what we did with Make Items Bookable, consolidating the items into
one call and invoking a single interface; we get "Can't book multiple resource
types at once".  Easiest solution may be to disable the menu entry if multiple
items are selected.  Alternately, we could open the first resource in the modal
UI and open new tabs for the extras, but then we're stuck using query params
instead of xulG

Signed-off-by: Jason Etheridge <jason@esilibrary.com>