relax SVN archive

Initialized merge tracking via "svnmerge" with revisions "1-21949" from
svn+ssh://bugman@.../svn/relax/trunk

Creation of a dedicated branch for developing the double rotor model of frame order.

Implemented to read spins from a SPARKY list, when no intensity column is present.

Addition to Support Request #3044, (https://gna.org/support/index.php?3044) - Load spins from SPARKY list.

Partial fix for bug #21338 (https://gna.org/bugs/?21338) - the bad sRGB profile in some PNGs.

This is only partial as some files are still to be converted (the original Bruker logo, and the
16x16, 22x22 and 32x32 sized Bruker icons).

Modified sparky file to have no columns with intensity.

Copied sparky list to be modified for sparky file without intensity column.

Improved the DPL94 dispersion model description in the manual.

The average_intensity() dispersion function now accepts the offset argument.

This is for better support of combined offset and spin-lock varied R1rho-type data. The argument is
then passed into the find_intensity_keys() function.

Updated the news announcement link for relax version 3.1.1 at http://www.nmr-relax.com/download.html.

The correct link is https://gna.org/forum/forum.php?forum_id=2423.

Updated the relax API documentation at http://www.nmr-relax.com/api/3.1/ to version 3.1.1.