address PR comments

• update error messages to be correct
• move suspended message into template and include for other pages
• check suspended status on all relevant pages and show message if

logged in user is suspended.

• fix possible nil pointer error
• remove changes to db schema files
• add version comment to migration
• add UserStatus type with UserActive and UserSuspended
• change database table to use status column instead of suspended
• update toggle suspended handler to be toggle status in prep for

possible future inclusion of further user statuses