Edit existing user outside of org as an orgadmin

[goddesswarship]

Issue summary
Org admins have limited access in the User Management tool (/appadmin/users.jsp) and can only see users associated with their org in accordance with security permissions. There are two use cases where managing users creates friction for their workflow:

1. Org admin wants to register a new user for their org, but the user's email address already exists in the system from a previous public encounter submission and Wildbook doesn't allow multiple accounts from the same email address. These are accounts with a UUID but there is no username, password, or role associated with them. Because these UUID placeholder accounts have no org association, an org admin can't search for them to make the account useable.
2. Org admin wants to add an existing registered user to their org. Any registered user that's not already in the org admin's organization will not appear in a user search.

Workaround
Org admin can contact staff or a site admin for help with completing registration on a shell account or adding the org to an existing user's account.

This is a work in progress while we discuss potential solutions.

[goddesswarship]

This doesn't appear to be an issue in later versions of Wildbooks, so the likely solution is for Whiskerbook to receive an upgrade as it's currently on 10.3.0. Leaving this open for now until we verify.