Small changes and fixes in the management list of users
Add migration to approve all users

Have to set all users as approved after the 'approved' flag was added, otherwise
old users won't be able to log in if the "require approval of users" if enabled.

refs #953
Merge remote-tracking branch 'upstream/branch-v2' into branch-v2

Conflicts:
	app/views/manage/_enabled_user.html.haml
Add icon for institutional admins

Done after mconf/mconf-web@71b999cba4dfd0e

refs #951