Bug 5877 : Offline circulation improvements : upload all files, apply at once

Bug 5877 : Offline circulation improvements : upload all files, apply at once

Offline circ : You now can upload all offline files from the Firefox extension.
Once all circ desks have uploaded the file, the librarian can apply all of them, sorted by date.
This avoid the problem of someone issuing an item on desk A, returning it on desk B.
Before this improvement, if desk B uploaded the file before A, the return was applied before the issue,
resulting in the items reamining issued.

Signed-off-by: Sophie Meynieux <sophie.meynieux@biblibre.com>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>