Fabio, I don't think any of these allows creation of a forum like this, let alone moving the existing data. Same problem with the wiki.
About sourceforge, it has phpBB for forums, MediaWiki and also MantisBT is available.
I use it for my projects, although I haven't activated these features, so I cannot comment how they work, but they are available. The complete list is:
Git Source Control
Project News News / Blog
Tracker Bug / Defects
AN Guestbook Guest Book
Bazaar Source Control
CodeStriker Code Review
CVS Source Control
dotProject Project Management
Gallery Image Gallery
IdeaTorrent Idea Brainstorm
Laconica Microblog
LimeSurvey Survey
Mailing Lists E-Mail
MantisBT Bug Tracking
MediaWiki Wiki
Mercurial Source Control
phpBB Forum
phpWebSite Content Management
Piwik Web Analytics
Screenshots Media
Subversion Source Control
TaskFreak! Task Management
Trac Wiki / Bug Tracking / Etc
URL Shortening Administrative
Wordpress Blogging