relax SVN archive

Switched to using the same classes as normal multi-model-free for the diffusion tensor grid search.

The model-free code setup is far, far too complex. The diffusion tensor parallel grid search
classes will be eliminated, and the normal model-free multi-command classes used for this purpose.

Bug fix for the test_R_to_axis_angle_180_complex() for MS Windows.

self.assertAlmostEquals() has to be used do to precision issues.

Fix for the test_bug_12670_12679() system test.

The Grace file lines are now not hardcoded!!!

Another fix for write_xy_header().

This time, "(normalised)" is not added to the X-axis label for normalised plots.

Another fix for write_xy_header().

The "world xmax" and "world xmax" were being set as the minimums!

Fix for the write_xy_header() method.

The args are now explicitly reset as they are lists and are persistent!

Removed the linestyle setting in write_xy_header() that made the line invisible.

Fix for the graph type determination in get_data().

Fixes for get_data() for when the analysis specific return_value() fn returns a list of values!

Clean up of the write() function for the new get_data() design.