relax SVN archive

Redesigned the structure.read_pdb() arguments and docstring.

Fixes for 4 of the structure.read_pdb() user function arg unit tests.

Removed the model arg unit test of structure.read_pdb() and added 4 new tests.

Created the new RelaxNoneStrListStrError error class and fixed the RelaxNoneStrListError print out.

Initialized merge tracking via "svnmerge" with revisions "1-8214" from
svn+ssh://bugman@.../svn/relax/1.3

Created a branch for the development of the ellipsoidal CS tensor.

This development will be done by Pavel Kaderavek (kada att chemi dot muni dot cz) and Petr Novak
(email address currently unknown). This branch is discussed in the threads starting at
https://mail.gna.org/public/relax-devel/2008-12/msg00046.html (Message-id:
<494272D5.2060909@...>) and https://mail.gna.org/public/relax-devel/2008-12/msg00045.html
(Message-id: <49426B50.4040908@...>).

Redesign of the args for the structure.read_pdb() user function.

Created a branch for modifying how relax handles multiple structures verses multiple models.

Currently relax handles models or ensembles of the same molecule verses different molecules very
poorly. This branch is for introducing massive changes to the PDB and structure reading and
handling.

The combine_models flag is now effective in the load_spins() function.

Created a new arg 'combine_models' to the structure.load_spins() user function.

This will allow spins to be extracted separately for each model in an ensemble or for only one set
of spins for all structures.