relax SVN archive

Wrote the new function find_index() for finding the global or local indices from a spin ID.

Bug fix for the loading of model-free results files from relax 1.2.

All minimisation statistics were being reset. The generic_fns.value.set() function now has the
reset flag to control this.

Fix for the second structure loading attempt.

Significantly expanded the test_load_results() system test.

All atomic data is now tested.

Fixed the test_load_results() system test.

Added some checks for the PDB files.

Fix for the Scientific structure object load_pdb() method.

Fix for the internal structure object load_pdb() method.

Updated the from_xml() to check the path and current directory for the structure.

A warning is raised if the file cannot be found.

Fixed the loading of the PDB file from from_xml().