relax SVN archive

Created a new script to test out the handling of Modelfree4 with PDB files and spheroid diffusion.

Fix for the execute() method when a PDB file is being used.

Modified the Modelfree4 system test to use a PDB file and spheroid diffusion tensor.

More fixes for create_run().

Fix for running Modelfree4 - the structure is properly copied in the create_run() method.

Fix for the check of the optimised tm value.

Fix for a typo in the global chi2 check.

Fix for the loading of global data from the mfout file.

This only happens when a global model is optimised. The parameters and chi2 value are in the mfout
file but are fixed or the sum of individual chi2 vals.

Removed a debugging print out.

The global chi2 and tm value are now extracted from the mfout file.