Merge remote-tracking branch 'upstream/develop' into develop
[gh-604] Remove code which auto-creates sites from WDN registry

Moving to a process where the WDN registry site request form is forwarded to the university ticket system, then site created manually
[gh-604] site-email no longer needed in site creation
[gh-604] Remove the WDN Registry connection settings form
[gh-604] Remove wdn registry variables from database
[gh-604] Add Email alert settings vars to del in update function