relax SVN archive

Added 4 more unit tests for the compile_2nd_matrix_*() functions, and modified one of the others.

Converted the isotropic cone frame order model to use the sinc() function.

This removes much round off error and significantly simplifies the equations.

Added a second unit test for perfect order in compile_2nd_matrix_iso_cone().

This checks values at and close to zero, as the sinc() function is differently defined at this
position.

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.