Added /upgrade to TODO.
Tweaked README, fixed links.
Use -Werror when compiling.
Removed twc-data.{h,c}.
Fixed typo.
Update VCS information
Prepare for release

Signed-off-by: Kill Your TV <killyourtv@i2pmail.org>
Merge branch 'debian/unstable' into debian/stable
prepare for release

Signed-off-by: Kill Your TV <killyourtv@i2pmail.org>
Added SQLite persistent storage for friend requests.
Added group chat code.
Wrote group chat invite code.
More group chats.
Added twc_uint32_reverse_bytes function.
Added /nospam command.
Prevented crash when typing into group chats.
Added name and Tox ID completion.
sd.
Fixed bugs with names containing spaces.
Formatting.