relax SVN archive

Improvements for the 2D Grace plots created by the rdc.corr_plot user function.

The autoscaling is now turned off, as the data set representing the diagonal (with points
[-100, -100] and [100, 100]) causes the world view to be set to be between -100 to 100 or -200 to
200.

The world view is set to be between -50 and 50 Hz, so that all RDCs should be visible. The ticks in
the plot have also been set so that the minor ticks are at every Hz increment.

Advances to the Grace 2D plotting abilities in the lib.software.grace relax library module.

The write_xy_header() function now accepts the new 'world', 'tick_major_spacing', and
'tick_minor_count' arguments. These allow the world view to be preset, and allow the ticks on the
X and Y-axes to be programatically changed. The write_xy_data() has also been modified so that the
autoscaling can be turned off, as this Grace command will overwrite the world view and tick setup.

Exampled the stereochemistry analysis section of the N-state model chapter of the manual.

Editing of the auto_analyses.stereochem_analysis module docstring.

The line wrapping to 100 characters has been removed.

Added a new section for the stereochemistry analysis to the N-state model chapter of the manual.

This is just an initial introduction and an inclusion of the sample script.

Replaced 'Q-factor' with 'Q factor' throughout the relax codebase.

This change to the correct notation covers code, comments, and docstrings.

Docstring improvements for the stereochem_analysis.py N-state model sample script.

The paragraphs are now all on one line and 'Q-factor' has been changed to 'Q factor'.

Spacing improvements in the stereochem_analysis.py N-state mode sample script.

Started to create a chapter for the N-state model or ensemble analysis in the manual.

This simply consists of a few introductory sections and the phathalic acid graphic.

Fixed the description of the N-state model in the pipe.create user function.

This has nothing to do with domain motions - it is the treatment of ensembles of structures.