Show how many extra users over the Stash license there are

We recently made some incorrect changes to an LDAP group, and Stash disabled pushes as we'd gone over the limit.

However, Stash doesn't actually tell you how many users you have over the limit! See attached screenshots.

We worked around this with the plugin provided at https://confluence.atlassian.com/pages/viewpage.action?pageId=317949653 but it's not ideal. It doesn't show readable user names, nor a total.

It's particularly confusing after STASH-2532, which means users may be listed in permissions when they aren't actually licensed users.

Ideally, Stash would always say how many licensed users there are, and provide a page to see who those users are e.g non-active, recently added etc.