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A very small speed up to the CR72 dispersion models by minimising repetitive maths operations.

The k_BA and k_AB rates are used to simplify the Psi calculation, dropping from 3 to 2
multiplications and removing a squaring operation. The Dpos and Dneg value calculations have been
simplified to drop one multiplication operation. And the calculation of eta_scale / cpmg_frqs now
only occurs once rather than twice.

Using the disp_profile_all.py script, the speed ups for these two models are:

100 single spins analysis:
CR72: 1.608+/-0.025 -> 1.552+/-0.028, 1.036x faster.
CR72 full: 1.795+/-0.043 -> 1.705+/-0.024, 1.053x faster.

Cluster of 100 spins analysis:
CR72: 0.109+/-0.001 -> 0.107+/-0.001, 1.026x faster.
CR72 full: 0.114+/-0.004 -> 0.110+/-0.001, 1.034x faster.

Shifted the rotor generation for the frame order geometric representation into its own function.

This is the specific_analyses.frame_order.geometric.add_rotors() function which adds the rotors are
new structures to a given internal structural object. The code has been extended to add support for
the double rotor model.

Replaced all self.num_frq with self.NM in target function.

Task #7807 (https://gna.org/task/index.php?7807): Speed-up of dispersion models for Clustered analysis.

Replaced all self.num_exp with self.NE in target function.

Task #7807 (https://gna.org/task/index.php?7807): Speed-up of dispersion models for Clustered analysis.

Replaced all self.spins with self.NS in target function.

Task #7807 (https://gna.org/task/index.php?7807): Speed-up of dispersion models for Clustered analysis.

Made the validation check in profiling of marix_power check all values.

Task #7807 (https://gna.org/task/index.php?7807): Speed-up of dispersion models for Clustered analysis.

Initial try to write up a 2x2 matrix by closed form.

Task #7807 (https://gna.org/task/index.php?7807): Speed-up of dispersion models for Clustered analysis.

Created an auxiliary function for automatically generating the pivots of the frame order analysis.

This is the new specific_analyses.frame_order.data.generate_pivot() function. It will generate the
1st or 2nd pivot, hence supporting both the single motion models and the double motion double rotor
model.

The frame order geometric representation functions are no longer PDB specific.

Instead the format argument is accepted. This will allow different formats to be supported in the
future. Because of this change, all specific_analyses.frame_order.geometric.pdb_*() functions has
been renamed to create_*().

Shifted the frame order geometric representation functions into their own module.

This is the new specific_analyses.frame_order.geometric module.