relax SVN archive

Fix for the fixing of parameters in the model-free analyses.

The diffusion tensor set_fixed() method is now used.

Fix for the XML output of the diffusion tensor - only the modifiable parameters are output.

This was the previous behaviour and is needed for the test suite to pass.

Converted the palmer.extract user function to use the new diffusion tensor design.

The diffusion tensor bmrb_read() function now uses the set_fixed() method instead of fixed().

The fix user function now uses the diffusion tensor set_fixed() method.

Renamed the diffusion tensor fixed() method to set_fixed() to avoid clashing with the 'fixed' object.

Fix for the model-free specific analysis duplicate_data() method for the new design.

The diffusion tensor __mod_attr__ object is now called _mod_attr.

Fix for the diffusion tensor to_xml() method for the new design.

For some reason the methods of the Element class are no longer blacklisted.

Converted the diffusion tensor data structure from_xml() method to the new tensor design.

Fix for the Diffusion_tensor.test_copy system test - the simulation parameters are now read-only.

Instead, the diffusion tensor set() method needs to be called.