The PDB have shifted their documentation from http://www.wwpdb.org/documentation/format33/v3.3.html
to http://www.wwpdb.org/documentation/file-format/format33/v3.3.html, stupidly without redirects.
This will create dead links in the relax API documentation at http://www.nmr-relax.com/api/3.3/, as
well as the older API documentation (http://www.nmr-relax.com/api/2.2/,
http://www.nmr-relax.com/api/3.0/, http://www.nmr-relax.com/api/3.1/,
http://www.nmr-relax.com/api/3.2/).
