relax SVN archive

Fix for r26460 - the second factor also needs to be inverted.

A divide by zero fix for the free rotor pseudo-ellipse.

This is in the compile_2nd_matrix_pseudo_ellipse_free_rotor() relax library function.

A divide by zero fix for the torsionless pseudo-ellipse.

This is in the compile_2nd_matrix_pseudo_ellipse_torsionless() relax library function.

Added the frame order matrix element graphs for the double rotor model.

Fixes for all of the calculated double rotor model frame order matrix graphs.

The X and Y angles were mixed up. The first torsion half-angle sigma1 corresponds to a y-axis
rotation and the second sigma2 corresponds to a x-axis rotation.

Added support for the double rotor model to the frame order matrix element simulation script.

The double rotation is constructed in the new rotation_double_xy_axes() method, and the checks for
the violation of the two torsion angles in the inside_double_rotor() method. In the main loop, the
theta, phi and sigma angles correspond to sigma1, sigma2, and nothing.

Reverted r26467 as too much was committed.

The command used was:
svn merge -r26467:r26466 .

Fixes for all of the calculated double rotor model frame order matrix graphs.

The X and Y angles were mixed up. The first torsion half-angle sigma1 corresponds to a y-axis
rotation and the second sigma2 corresponds to a x-axis rotation.

Added the frame order matrix element graphs for the out-of-frame free rotor pseudo-ellipse model.

Added the frame order matrix element graphs for the in-frame free rotor pseudo-ellipse model.