relax SVN archive

Fixes for the checks in the Frame_order.test_pdb_model_* system tests.

Atomic positions are now checked with self.assertAlmostEqual() to 3 places, and the residue and atom
names and numbers are checked with self.assertEqual().

Created the Frame_order.test_pdb_model_pseudo_ellipse_z_axis system test.

This demonstrates the correct atom coordinates in the PDB file created by the frame_order.pdb_model
user function for the pseudo-ellipse model along the z-axis.

Fixes for all of the Frame_order system tests - the temporary directories are now being deleted.

The system test base class tearDown() method is now being called to properly clean up after the
tests.

Alphabetical ordering of the Frame_order system test methods.

Fixes for the printouts from the Frame_order.test_pdb_model_rotor_* system tests.

Improvements for all of the Frame_order.test_pdb_model_* system tests.

The rotate_from_Z() method has been introduced to simplify the determination of the 3D coordinates
expected for the PDB file. This will allow for more advanced testing of the PDB for the cone
models.

Renamed all of the Frame_order.test_pdb_model_* system tests to be more descriptive.

Created the Frame_order.test_pdb_model_iso_cone_xz_plane_tilt system test.

This checks the PDB file from the frame_order.pdb_model user function for the isotropic cone model
with a xz-plane tilt.

Printout fix for the axis in the Frame_order.test_pdb_model_iso_cone system test.

Fix for the representation label positions created by the frame_order.pdb_model user function.

The 'size' argument was not being used at all for the representation title
atoms. It is now passed into the add_titles() function as the displacement argument + 10 Angstrom.