relax SVN archive

Fix for the test_copy() system test.

The wrong indices were being checked.

Extended the test_copy() system test to properly check if a copy is made, rather than link.

Bug fix for the __update_sim_append() method.

Now the diffusion tensor simulation structure appending works if the structure doesn't already exist.

The spherical diffusion tensor system tests are now properly set up.

Bug fix for the diffusion tensor MC sim data structures.

All structures are now properly updated when a value for a single simulation changes.

The diffusion tensor MC sim data is now properly set up.

The ellipsoid diff tensor PDB file is now being checked, line for line.

Bug fix for the creation of the spheroid diff tensor PDB representation.

The simulation vectors should be initialised to a list.

Bug fix for the creation of the ellipsoid diffusion tensor PDB representation.

The axes are now labelled Dx, Dy, and Dz instead of all Dpar!

Removed some debugging code.