relax SVN archive

This is now the Test_msa.test_central_star unit test of the _lib._sequence_alignment.test_msa unit
test module (it was originally in the _lib._sequence_alignment.test_align_protein unit test module).
This is in preparation for converting the
lib.sequence_alignment.align_protein.align_multiple_from_pairwise() function into the
lib.sequence_alignment.msa.central_star() function.