relax SVN archive

Fix for the assemble_scaling_matrix() method.

The current data pipe is now aliased as required.

Added a missing import.

Added the modified OMP PDB file 1F35 with only H and N atoms present and created through Molmol.

Added some missing imports.

Renamed run to data pipe in the model selection function.

Fix for the omp model-free optimisation system test.

The fix() user function is properly called.

Converted the fix() function to the new design.

Fixed the fix() user function docstring.

Converted the fix() class method to a module function.

Converted the fix() user function interface to the new design.