relax SVN archive

The "Protein dynamics" and "relax libraries" sections have been split into a "main_box" div box.

More div box fixes for http://www.nmr-relax.com/links.html.

The 4.0.0 and 4.0.1 download links now point to http://www.nmr-relax.com/download_request.html.

These releases are no longer in the download area.

Fixes for the index at http://www.nmr-relax.com/links.html.

Div box fixes for the http://www.nmr-relax.com/links.html page.

Added links to the SourceForge, GitLab, and GitHub nmr-relax infrastructure sites.

This is for http://www.nmr-relax.com/links.html. The public domain or CC BY-SA 4.0 licenced logos
from Wikipedia have been added and modified.

More sectioning for the links at http://www.nmr-relax.com/links.html.

This includes a section for relax infrastructure, mailing list archives, and web resources.

The 3.3.6 to 3.3.8 download links now point to http://www.nmr-relax.com/download_request.html.

These releases were removed from the download area a long time ago.

Changed all the relax download links to point to the new release subdirectories.

This is for http://www.nmr-relax.com/download.html.

Updates to the upload section of the release checklist document for sending files to SourceForge.