relax SVN archive

Converted the map() user function interface to the new relax design.

Converted the map() and run() functions to the new relax design.

Renamed the opendx.opendx module to opendx.main.

Converted the class methods into module functions.

Renamed the dx module to opendx to avoid name clashes.

Fixed the call to the OpenDX run() method.

Fixes for the Diffusion_tensor.setUp method.

The fixed flag is now a bool.

The spectral density calculation system test now passes.

The index for the internal test values now exists.

Fix for the spectral density calculation system test.

The proton type is now set.

Added some missing RelaxError imports.