relax SVN archive

Corrected a path from relative to absolute.

Corrected a test for the loading of a PDB.

This is one step towards the structure.create_diff_tensor_pdb() function working.

Added a test within the diffusion tensor system tests.

This one tests the structure.create_diff_tensor_pdb() function.

Fix for the function arg unit test of eliminate().

Added a missing import.

Caught all tuple types in the args arg unit test of eliminate().

More fixes for the arg unit tests of the eliminate() user function.

Fixes for the arg unit tests of the eliminate() user function.

Renamed an incorrectly named unit test module.

Wrote the arg unit test module for the eliminate() user function, with 2 unit tests.