relax SVN archive

Added "dir" as input to the userfunction relax_disp.sherekhan_input in systemtest.

bug #21995: (https://gna.org/bugs/index.php?21995) Creating sherekhan input files, with data for several fields and different time_T2

Made testing of files for systemtest -s Relax_disp.test_sod1wt_t25_to_sherekhan_input.

bug #21995: (https://gna.org/bugs/index.php?21995) Creating sherekhan input files, with data for several fields and different time_T2

WARNING: The sherekhan user function will write to current directory!.

Removed the necessity that len(cdp.relax_time_list) = 1 when issuing the sherekhan input user function.

bug #21995: (https://gna.org/bugs/index.php?21995) Creating sherekhan input files, with data for several fields and different time_T2

Created systemtest to catch the error -s Relax_disp.test_sod1wt_t25_to_sherekhan_input.

bug #21995: (https://gna.org/bugs/index.php?21995) Creating sherekhan input files, with data for several fields and different time_T2

Fix for fatal print command left over.

Added a paragraph to the clustering section of the dispersion chapter covering parameter copying.

This explains the purpose of the relax_disp.parameter_copy user function.

Fix for the relax_disp.parameter_copy user function description.

The parameters are not averaged but instead the median value from all spins is taken.

Modified systemtest Relax_disp.test_sod1wt_t25_to_cr72.

Fix for the relax_disp.parameter_copy function.

The median of the values was not performed properly, since 0.0 was already in the starting list of values.

Fix for setting the pre-set values in grid_search.

Feature request: #3151, (https://gna.org/support/index.php?3151) - User function to set the R20 parameters in the default grid search using the minimum R2eff value.

Now test that values which are of dict types, has more than 0 values.