relax SVN archive

This is a major feature and bugfix release. New features include the statistics.aic and
statistics.model user functions, plotting API advancements, huge speed ups for the assembly of
atomic coordinates from a large number of structures, the sorting of sequence data in the internal
structural object for better structural consistency, conversion of the structure.mean user function
to the new pipe/model/molecule/atom_id design, and improvements to the rdc.copy and pcs.copy user
functions. Bugs fixed include the incorrect pre-scanning of old scripts identifying the
minimise.calculate user function as the old minimise user function, Python 3 fixes, and the failure
in reading CSV files in the sequence.read user function.