Updated the download page to point to the new 1.2.11 relax release.
Only GNU/Linux and source packages have been release so far. The 'Old releases' download page
section has been extended to include links, md5sums, GPG sigs, and file sizes for versions 1.3.0,
1.2.11, and 1.2.10. In the future, all relax packages will be listed here.
