Issue 786 : Orbit nonKeplerianAcceleration method modification
- The behaviour of the hasNonKeplerianAcceleration method has been corrected.
- A test for the issue 786 was added based on the test provided by Evan Ward.
- Test testToOrbitWithDerivatives() and its method doTestToOrbitWithDerivatives were modified to include a nonKeplerian acceleration coherent was the corrected behaviour of hasNonKeplerianAcceleration.