relax SVN archive

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.

Fixes for the data_store.seq_align.Alignment.generate_id() method.

These problems were identified by the _data_store.test_seq_align module
Test_seq_align.test_alignment_addition unit test.

Created the Test_seq_align.test_alignment_addition unit test.

This is in the _data_store.test_seq_align unit test module. This tests the setup of the sequence
alignment object via the data_store.seq_align.Sequence_alignment.add() method.

Spelling mistake in the Sequence_alignments class name.

Added the seq_align module to the data_store package __all__ list.

Created the new relax data store object for saving sequence alignments.

This is in the new data_store.seq_align module via the Seqence_alignments object, subclassed from
RelaxListType, for holding all alignments and the Alignment Element object, subclassed from Element,
for holding each individual alignment. The objects are currently unused.