relax SVN archive

Added two simple unit tests for printing out the contents of a data pipe.

This tests the PipeContainer.__repr__() method.

Disabled the unit test for spin selections with parentheses.

This test can wait until someone tries to implement the feature.

Added a system test for the loading of spins from a small molecule.

This uses the Scientific Python PDB data object.

Fixed all the test suite tests pointing to the renamed 'test.pdb' file.

Renamed one of the test suite PDB files.

Added a directory for the structural data of the test suite and added a small molecule structure.

Started to convert the model-free read_columnar_results() method to the new relax design.

Modified the API documentation construction so that most of the test suite is not present.

The pipe type of None is no longer checked for in the PipeContainer.is_empty() method.

Modified the unit test of the PipeContainer.is_empty() method.

The pipe type can be set in an empty pipe.