relax SVN archive

Replaced funtion atan(omega1 / Delta_omega) with atan2(omega1 , Delta_omega), to make sure returned theta values are between 0 and pi.

This was done in the function return_offset_data() in the specific_analyses of relax_disp.
This was discussed in: http://thread.gmane.org/gmane.science.nmr.relax.devel/5210.

Shifted two functions from pipe_control.angles into the new lib.geometry.angles module.

This is the fold_spherical_angles() and wrap_angles() functions which are not related to the relax
data store and hence can be made independent.

Added the relax version 3.1.7 manual to the repository.

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.