relax SVN archive

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).

Important formatting improvement for the description in the GUI user function windows.

Previously lists, item lists, and prompt items were spaced with one empty line at the top and two at
the bottom. The two empty lines at the bottom was an accident caused by how the list text elements
were built up. Now the final newline character is stripped so that the top and bottom of the lists
only consist of one empty line. The change can give a lot more room in the GUI window.

Modified the Structure.test_sequence_alignment_molecules system test.

Changed and expanded the arguments to the yet to be implemented structure.sequence_alignment user
function.

Renamed the Sequence.test_align_molecules system test to Structure.test_sequence_alignment_molecules.

As the sequence alignment is dependent on the structural data in the relax data store, the user
function for sequence alignment would be better named as structure.sequence_alignment. The
sequence.align user function is not appropriate as all other sequence user functions relate to the
molecule, residue, and spin data structure of each data pipe rather than to the structural data.

Created the Sequence.test_align_molecules system test.

This will be used to implement the sequence.align user function which will be used for performing
sequence alignments on structural data within the relax data store and storing the data in the data
pipe independent sequence_alignments data store object (which will be an instance of
data_store.seq_align.Sequence_alignments). The system test also checks the XML saving and loading
of the ds.sequence_alignments data structure.

Shifted the data_store.seq_align.Alignment.generate_id() method into the relax library.

It has been converted into the lib.structure.internal.coordinates.generate_id() function to allow
for greater reuse.

Implemented the data_store.seq_align.Sequence_alignments.find_alignment() method.

This will only return an alignment if all alignment input data and alignment settings match exactly.

Code rearrangement in the _data_store.test_seq_align unit test module.

The ID generation has been shifted into the generate_ids() method to be used by multiple tests.

Added the Test_seq_align.test_find_alignment and Test_seq_align.test_find_missing_alignment unit tests.

These are in the _data_store.test_seq_align unit test module. They check the functionality of the
currently unimplemented Sequence_alignment.find_alignment() method which will be used to return
pre-existing alignments.