Updated the public Git tree

I have just updated the public git tree with a serie of patches that improves compatibility with Python2.5 and removes bits of obsolete code. I have also tagged 0.2.5 the current HEAD of the tree, but this is for testing purpose only, and so I have not created packages for Windows and Debian/Ubuntu. Indeed, there are still some bugs that I have prepared diffs for, and I expect to push some more updates soon.