relax SVN archive

Converted the duplicate title finding shell script into a Python script.

The Python script is far more advanced and uses a different logic to produce a table of replicated
titles and their count. The script also returns a failed exit status when replicates exist.

Updated the shell script for finding duplicated titles in the LaTeX files of the manual.

Removed a double full stop from the Softpedia link at http://www.nmr-relax.com/links.html.

Added a number of redirects.

This includes a link to the API documentation which changed names during the development of the 3.3
and 3 errors in user function links to the manual in the relax release notes.

More minor changes to the 'Announcement' section of the release checklist document.

One more wiki instruction about checking for dead links in the release checklist document.

Updated and improved the wiki instructions in the relax release checklist document.

Editing and fixes for the relax 4.0.0 part of the CHANGES file.

Fixed the date on the download page for relax 4.0.0 - it was tagged on the 7th of Oct.

Updated the http://www.nmr-relax.com/download.html webpage for the relax 4.0.0 release.