This makes it easier to navigate between different blog sections: Customize, Stats, View.

This changes all variables and functions from using Suspend{ed} to using
Silence{d} as well as documentation, errors and logging.

- 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