relax SVN archive

Implemented the data store Sequence_alignments.from_xml() method.

This method is required for being able to read RelaxListType objects from the XML file.

Fixes for handling the sequence_alignments data store object.

More advanced support for different numpy number types in the lib.xml relax library module.

This allows numpy int16, int32, float32, and float64 objects to be stored and retrieved from relax
XML save and results files.

Fix for a fatal bug introduced in the last commit (r27398).

The data store ds.sequence_alignment object is now being treated as special and is blacklisted.

The object is now explicitly recreated in the data store from_xml() method.

Fixes for the sequence alignment objects for the relax data store.

The Sequence_alignments(RelaxListType) and Alignment(Element) classes were not being set up
correctly. The container names and descriptions were missing.

Implemented the backend of the structure.sequence_alignment user function.

This checks some of the input parameters, assembles the structural objects then the atomic
coordinate information, performs the multiple sequence alignment, and then stores the results.

Spun out the atomic assembly code of the assemble_coord_array() function.

The code from the lib.structure.internal.coordinates.assemble_coord_array() function has been
shifted to the new assemble_atomic_coordinates(). This is to simplify assemble_coord_array() as
well as to isolate the individual functionality for reuse.

Modified the assemble_coordinates() function of the pipe_control.structure.main module.

The function has been renamed to assemble_structural_objects(). The call to the
lib.structure.internal.coordinates.assemble_coord_array() function has also been shifted out of
assemble_structural_objects() to simplify the logic and decrease the amount of arguments passed
around.

Created the frontend for the structure.sequence_alignment user function.

This is based on the structure.align user function with the 3D superimposition arguments removed and
new arguments added for selecting the MSA algorithm and the pairwise alignment algorithm (despite
only NW70 being currently implemented).