Move to GitHub

[xoft]

Now for the wiki: should we move it or keep it as-is? I'd like to explore the options. I once had an idea that the API documentation part of the wiki could be automatically generated from the sources (doxygen-style), but that would require some kind of programmatic access to the wiki data. Also, is it possible to dump the wiki data somehow, so that it can be read offline, or restored at a different location / whatever?
If we decide not to move at this moment, we should probably remove the wiki option from the github settings