relax SVN archive

Converted the specific_fns.relax_data.read() to the new relax design.

Created the RelaxNoSpinError class.

Added 5 unit tests for the generic_fns.selection.generate_spin_id() function.

Created the new function generic_fns.selection.generate_spin_id().

This will return an ID string for the spin.

Removed the Rx_data class instance from self.relax.specific.

The class instance is now within the module to be imported by who ever wants it.

Copyright label update.

Turned the 2 new dirs into modules.

Added the last two missing relax base directories for holding unit tests.

Removed the formatted docstring file from the repository.

This file needs to be regenerated each time and is an automatically created file. Its placement in
the repository is not necessary.

Bug fix for the docstring of the generic_fns.diffusion_tensor.return_data_name() function.

The docstring, because it is joined onto user function docstrings, must have indentation of 8 spaces
as well!