relax SVN archive

Backported the relax 3.1.7 CHANGES file changes to trunk.

The command used was:
svn merge -r22487:22488 svn+ssh://bugman@.../svn/relax/tags/3.1.7 .

Small fix for the CHANGES file.

Changed the version number to 3.1.7.

Backported the relax 3.1.7 CHANGES file addition to trunk.

The command used was:
svn merge -r22484:22485 svn+ssh://bugman@.../svn/relax/tags/3.1.7 .

Updated the CHANGES file for relax 3.1.7.

relax version 3.1.7.

This is a minor feature release which includes improvements to the relaxation dispersion chapter of
the manual and the addition of new infrastructure for R1rho data handling in the dispersion
analysis.

Added print-out of Omega, the average resonance offset, in calc_rotating_frame_params().

Regarding sr #3124, (https://gna.org/support/index.php?3124) - Grace graphs production for R1rho analysis with R2_eff as function of Omega_eff.

Added interpolation calculation of theta and w_eff, when dispersion points are interpolated.

Regarding sr #3124, (https://gna.org/support/index.php?3124) - Grace graphs production for R1rho analysis with R2_eff as function of Omega_eff.

Modified unit and systemtest to reflect new calculation of rotating frame tilt angle Theta.

Regarding sr #3124, (https://gna.org/support/index.php?3124) - Grace graphs production for R1rho analysis with R2_eff as function of Omega_eff.

This was discussed in thread: http://thread.gmane.org/gmane.science.nmr.relax.devel/5205.

Fix for calculating the theta angle describing the tilted rotating frame relative to the laboratory, when omega1 / Delta_omega is negative.

Regarding sr #3124, (https://gna.org/support/index.php?3124) - Grace graphs production for R1rho analysis with R2_eff as function of Omega_eff.

This follows discussion in: http://thread.gmane.org/gmane.science.nmr.relax.devel/5205.