relax SVN archive

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.

Commented out the Gmane links at http://www.nmr-relax.com/links.html.

This is at least until Gmane is back up.

More precision decreases in the Rx.test_r1_analysis GUI test.

This is to allow the test to pass on wxPython-Phoenix and Python 3.

Updated the copyright notice in the GUI splash screen to 2001-2016.

Removal of unused variables from the bash completion relax script.

Fine tuning of the bash completion relax script.

The option "-o nospace" for "complete" has been removed as spaces are not added for directories
anyway. This means that a space is added after all options and scripts.