relax SVN archive

Converted the back_calc() function to the new relax design.

Shifted the reset() functional code to generic_fns.

Removed the dependence on the relax data store by using the pipes API.

Created the has_pipe() function for the pipes API.

Updated the latex_mf_table.py sample script to the new design.

The problems were identified with the import of the relax data storage object.

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.