fixes #3736 - users API uses login name as an identifying attribute

fixes #3684 - add IDs to top level dropdown menus

fixes #3673 - auditing added to ptable w/ test

fixes #3683 - display free and available space in vSphere datastore selection

fixes #3510 - plugin interface for registering a plugin, updated menu system

fixes #2763 - correcting doco links

fixes #3659 - use URL host for hostname, not URL itself

fixes #3698 - add image_id alias to server resource as form uses it

fixes #3661 - mis-redirection from /hosts/fqdn/edit to /hosts

fixes #3493 - check if auto user reg is allowed for auth source