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The rigid frame order matrix for the pseudo-ellipse models is now correctly handled.

This allows the rigid case RDCs to be correctly calculated for both the pseudo-ellipse and
torsionless pseudo-ellipse models. The previous catch of the theta_x cone angle of zero was
incorrectly recreating the frame order matrix, which really should be the identity matrix. However
truncation artifacts due to the quadratic SciPy integration still cause the model to be
ill-conditioned near the rigid case. The rigid case is correctly handled, but a tiny shift of the
parameters off zero cause a discontinuity.

Fix for the fix of r23978, the theta_x angle should be checked for zero as it is the smallest.

Updates for the chi-squared value in all the Frame_order.test_rigid_data_to_*_model system tests.

This is now much reduced as the true rigid state is now being tested for.

Fixes for all PCS numeric integration for all frame order models in the rigid case.

The exact PCS values for the rigid state are now correctly calculated when no Sobol' points lie
within the motional model. The identity matrix is used to set the rotation to zero, and the PCS
values are now multiplied by the constant.

Fix for the frame order matrix calculation for a pseudo-elliptic cone with angles of zero degrees.

The lib.frame_order.pseudo_ellipse_torsionless.compile_2nd_matrix_pseudo_ellipse_torsionless()
function has been changed to prevent a divide by zero failure. The surface area normalisation
factor now defaults to 0.0.

Modified the rigid_test.py system test script to really be the rigid case.

This is used in all of the Frame_order.test_rigid_data_to_*_model system tests. Previously the
parameters of the dynamics were set to being close to zero, to catch the cases were a few Sobol'
PCS integration points were accepted. But now the case were no Sobol' points can be used is being
tested. This checks a code path currently untested in the test suite, demonstrating many failures.

Added a timeit script and log file for different ways of checking a binary numpy array.

The frame_order.pdb_model user function no longer tries to create a cone object for the double rotor.

Updated the double rotor frame order model to be in a pseudo-functional state.

Bugs in the target function method have been removed, the calc_vectors() target function now accepts
the pivot2 argument (but does nothing with it yet), and the lib.frame_order.double_rotor module has
been updated to match the logic used in all other lib.frame_order modules.

The frame order target function calc_vectors() method arguments have all been converted to keywords.

This is in preparation for handling a second pivot argument for the double rotor model.