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The tmax_pseudo_ellipse() fn now handles the zero points correctly.

Large simplifications to the equations of the pseudo-ellipse frame order model.

This significantly increases the numerical stability and allows parameters to be close to zero.

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.