issue 3551 and others

https://code.google.com/p/otwarchive/issues/detail?id=3551 Ability to ban email addresses from being used in guest comments Archive-wide (admin feature)
https://code.google.com/p/otwarchive/issues/detail?id=3550 Block permanently suspended users from creating new accounts with the same email addresses
https://code.google.com/p/otwarchive/issues/detail?id=2553 Reserve user names

Squished version

added it to settings menu ui

renamed admin to archive settings

deleted show column

visual fix