Do I have to download the SVN trunk to get uncomplied source code?
yes, I think so. At least if you want other than the ones on sourceforge.
Why no 2.1 Final src?
see http://svn.magnolia.info/view/magnolia/tags/magnolia2.1/
You can browse the SVN and download the sources from there with e.g.
TourtoiseSVN
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