Added

Make gopher links out of posted URIs!
Special codes: you can define keys associated with strings in your config.toml, if a
post's entire message is <somekey> where somekey belongs to an entry in the
specialCodes table, then the post will be presented as the corresponding value.
Prevent the creation of threads with a message that already exists as a thread OP
Prevent accidental reposting + some spam by disallowing posting a reply which has the
same IP and message as the last reply in the same thread. This is nice for preventing
an index search result from being refreshed, when the user intends to simply refresh
the thread, and it resulting in an accidental repost.

Changed

Rate-limit messages broken down into two separate messages for reply rate limit and
new thread rate limit