Remove extra tabs

This, my friends, is the very first ModernBB 3 commit to be made! Here,
our long journey starts!
#487 Update advanced bans interface
Merge branch 'version2.2' into version3.0
#469 First steps for new Backstage design

- Updated buttons
- New font-family
- Darker lay-out
- No shadows
#469 New color scheme, better contrast
Update Bootstrap to 3.1-dev
#469 Other enhancements to the Backstage
#516 Improve Backstage pages for more consistence
#469 Update style to support #516
Simplyfi update checker
#510 Remove tags from board discription
#512 Require at least FluxBB 1.5 to upgrade
#368 Update the design of the action bar
#351 Merge forums.php and categories.php

Only category names and position need to be replaced before it's done!
:)
#351 Remove categories.php and merge it to board
#220 The SQLite 3 DB Layer
#244 Implementate in files
#245 Add support for SQLite 3 to db_update
#220 Hack support in the layer
#367 We do not support PostgreSQL anymore