implemented accountHasAdmin and accountHasAccess

Sets added/modified:
- #       account:no:admin                            // Set of all events this account is allowed to modify
- #       account:no:invite                           // Set of all events this account is allowed to view
- #       eventadmins:owneracctno:eventno             // Set of all accounts allowed to modify this event
- #       eventviewers:owneracctno:eventno            // Set of all accounts allowed to view this event