[BF] Redirection for non-supers generated insufficent perms error

Also fixed spelling mistake.
[BF] Placement of this condition broke add
Merge branch 'inex-live' of https://github.com/inex/IXP-Manager into inex-live
Merge branch 'inex-live'
Merge fix from inex-live
Merge branch 'im-contacts-user' of https://github.com/opensolutions/IXP-Manager into im-contacts-user
[BF] Prevent insuff perms error for non-super admins
[IM] Fixes from NB by email.
[HK] Fix changelog; fix documentation; formatting; capitalisation
[HK] Code review
[BF] Should only apply to adding, not editing
[DB] User-parent-ectomy
[HK] Small tweaks during testing
[IM] Add switch user fn to contacts and fn for disabled users
[IM] Destination on add / edit / cancel working for customer overview tabs
[IM] Only show aggregate graph on overview if there can be one
[IM] Code review of user / contact deletion flow
[IM] Form layout, elements and control flow for cust admins
[IM] Small tweaks for cust admins acting on contacts
[IM] Completed CUSTADMIN management of contacts and users