relax SVN archive

Created the Structure.test_bug_22041_atom_numbering system test to catch bug #22041.

This was reported at https://gna.org/bugs/?22041.

The problem is that the structure.write_pdb user function does not create the correct atom serial
numbers.

Another fix for the dead link finding script.

And some more improvements for the dead link finding script.

More improvements for the dead link finding script.

Added another redirect to http://www.nmr-relax.com.

Some improvements for the dead link finding script.

Added some more dead links to the .setup_redirects.py script.

The script has been executed and the auto-generated files added to the repository. This should fix
most of the dead links found in the relax mailing list archives.

Created a script for finding all dead http://www.nmr-relax.com links in files of a directory tree.

Fix for the fdl.html link in the footer of all http://www.nmr-relax.com pages.

The URL is now absolute and includes http://www.nmr-relax.com. Otherwise for pages located in
subdirectories such as http://www.nmr-relax.com/analyses/relaxation_dispersion.html and
http://www.nmr-relax.com/api/index.html will include the subdirectory in the link.

Fixes for the main section links at http://www.nmr-relax.com/analyses/relaxation_dispersion.html.