relax SVN archive

Implemented the sinc() function.

Wrote 4 unit tests for the compile_2nd_matrix_iso_cone*() frame order functions.

Added the maths_fns.coord_transform module to the package __all__ list.

Fixed another 2 trig typo bugs in populate_2nd_eigenframe_iso_cone().

These are the same issue, sin(2.0*tmax)**2 should have been sin(tmax)**2.

Fixed a bug in populate_2nd_eigenframe_iso_cone().

One of the many trig functions were incorrectly typed out.

Created maths_fns.order_parameters.iso_cone_theta_to_S() function for angle to order param conversion.

The isotropic cone parameter cone_theta is now being unpacked and stored after optimisation.

Bug fix for the frame order _update_model() method for the isotropic cone.

The cone angle parameter cone_theta was incorrectly referenced.

The isotropic cone frame order model now uses the full eigenframe.

This is necessary to define the torsion angle restriction.

The frame order specific module now uses spherical_to_cartesian().