relax SVN archive

Added checks for the presence of the data structures necessary for frame_order.cone_pdb().

Expansion of frame order to both the forward and reverse rotations.

reduce_alignment_tensor() was renamed to reduce_alignment_tensor_reverse(), and the new function
reduce_alignment_tensor() added.

Wrote the calculate() method for calculating the chi-squared value for the current parameters.

The user can now set the number of increments used to generate the cone PDB.

Made the cone_pdb() function less specific for the N-state model and added SIM as an axis to decorate.

Renamed the axis atom from 'Axe' to 'Axis'.

cone_pdb() now handles the AXE residue.

Changed the scaling arg to a direct size arg.

Bug fix for the pymol.cartoon() user function.

This was failing when multiple proteins were loaded.

Added a test for a loaded structure to the pymol.cartoon() user function.