With the recent update of the forum, there has been a change to the software that I have suggested: Now I have set up the forum, so that everyone can turn their posts into wiki-posts, so that they can be edited collaboratively! Just click on the pencil and paper symbol at the end of your post to make it a wiki-post.
To edit a wiki-post just click on the pencil and paper symbol in the top right of a post.
If you create a new topic and wikify the opening post, then you should add the “wiki” tag to the topic!
With the new tag plugin you can filter the forum for topics that have a specific tag. When you filter for the “wiki” tag, then you get the equivalent of a wiki right here in the forum! This is really awesome! With those recent changes to the forum software, it becomes a viable alternative to dedicated wikis!