relax SVN archive

Renamed the stereochem_analysis_config.py file to the stereochem_analysis.py relax script.

Added the relative stereochemistry analysis configuration file.

This will be converted into a relax script.

Added to the auto_analyses the script for determining relative stereochemistry of organic molecules.

This code corresponds to a paper in press. The script will need to be modified to function as an
auto-analysis, and the actual configuration file turned into the real script.

Modified the _auto_analyses.test___init__ module for the auto_analyses package.

Added a __ini__ module to the _auto_analyses unit test package.

Copied the __init__.py unit tests module from the _specific_fns directory.

Added a directory for the unit tests of the modules of the auto_analyses package.

Docstring fix for pcs.calc_q_factors().

Created the rdc.calc_q_factors() and pcs.calc_q_factors() user functions.

The back-calculated RDC/PCS data must first be generated by the specific code.

The Q-factor calculation functions can now accept a spin_id arg.

As there can now be data problems, the functions check if there is any selected spins looped over,
that the is RDC/PCS data, and that there is back-calculated RDC/PCS data.