relax SVN archive

Documentation fix in the sample script.

Converted the relax_curve_diff.py sample script to the new design.

This was identified by the unnecessary import of the relax data storage object.

Removed the columnar formatted results writing code.

This is no longer necessary because of the universal XML results file. Found by searching for
usage of the relax data store.

Removed all unused imports of the relax data store.

Removed unused RelaxNoPipeError imports and some old code.

Removed a pile of unused and significantly out of date functions.

Removed some unused imports of RelaxNoPipeError.

Removed all references to ds[key] by using the API of generic_fns.pipes.

Eliminated all access to 'ds.current_pipe' by using the API of generic_fns.pipes.

Eliminated all mentions of 'ds[ds.current_pipe]' by using the generic_fns.pipes API.