Merging when double posting
If an user wants to post in a thread and it'd be his second post a row in this thread, it'll merge his posts.
Author: bryn
Submitted: 16th March 2005
If somebody writes a new post in thread X, and he wrote the lastest post in
this thread, it merges the new post with the previous one. It also prevents
to add a post to post counter. But, however, it marks topic X as a topic
with new posts and puts this topic into "Last post" column in the category
list in main page.