I created a first preview, that only fixes the import of annotations, there are still a lot of other issues to tackle. I only tested this on some limited number of (small) files.
See the \Programs\_xournal\ReadMe.txt for installation/usage/issues.
Xournal uses some of the libraries from the Base-package that
Iņigo published, for convenience I included them in this package.
Please let me know any issues that you find (if they are not yet in the known issues list).
Thanks,
Marcel.