Create an admin recovery script rather like what Gallery does

This came out of a conversation over lots of pasta with Skodak.....

In order to recover lost administration rights, implement something similar to Gallery. The outline is as follows...

• Create a "hidden" (but documented) script in the admin folder..... recoveradmin.php or somesuch
• It invites you to create a file in the moodle root with a given name and a randomly generated key therein and then refresh the page
• The rest of the process is locked out until this file is found to be correct - obviously, this needs to be locked down properly (I'll look/steal what Gallery does)
• Once you're in there it will do this...
  • • Allow a new manual user to be created and assigned to the administrator role
    • Reset the administrator role (and assignment rights) to default
    • Reset the User Policy settings to default (a source of locked out admins)
• The above should be options probably
• The Moodle site will NOT run with the key file in place as an additional security feature.