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Fix for the test_compile_2nd_matrix_pseudo_ellipse_restriction_test3() frame order unit test.

Simplified populate_2nd_eigenframe_iso_cone() even further.

This should bring some numerical stability.

Added 9 unit tests for the parametric restriction collapse of all frame order model compile_2nd_matrix*() fns.

Bug fix for the iso cone frame order model fn populate_2nd_eigenframe_iso_cone().

A few signs were wrong in the {0,4} and {4,0} element.

Created a unit test for the collapse of the isotropic cone to the free rotor iso cone.

Added 2 unit tests for the free rotor pseudo-ellipse frame order model.

Added 2 more unit tests of compile_2nd_matrix_pseudo_ellipse().

Deactivated 2 frame order unit tests as these cannot be satisfied with numerical integration.

Added 4 frame order unit tests for half cones rotated 90 deg about y.

Added a eigenframe rotation to test_compile_2nd_matrix_pseudo_ellipse_free_rotor_half_cone().