added "New topics by moderators only" option for forums
Revert "added "New topics by moderators only" option for forums"

This reverts commit ed14c36cfc2aa1e5c846758c15df4b2923e65b26.
Revert "Revert "added "New topics by moderators only" option for forums""

This reverts commit 1208adad4b2649103fe1b398e408d1d4d0157de2.
BBCode fixes and enhancements
Set default timezone to UTC. Offsets will be handled by template tags.
adds tracker feature #408
Merge branch 'master' of https://github.com/lightnin/DjangoBB
fixes tracker bug #439
fixes tracker bug #439
fixes bug #471
adds feature #444
fixes bug #448
fixed a bug in post deletion
fixes bug #439
adds feature #191
changes the "closed thread" icon from a padlock to a grey dot
adds feature #80
enables lofi
fixes pagination in lofi
adds unread links to lofi