Main differences between V4.1 and V4.0

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New methods for Cartesian/Spherical transformation Jacobian matrixes computation
New RK6 interpolator (more precise one as its order is 2; error in position is about some centimeters on a LEO orbit rather than few hundreds of meters as previously).
New class to collect environment models data (ForceModelsData class).
Access to potential coefficients.
Rediffused SRP modified when reduction of the amount of sources (see JavaDoc).
Glint position vector available (GlintApproximatePointingDirection class).
Adding several classes and methods (as getters or clone/copy) from GENOPUS.
New IntervalleOccurrenceDetector class

Correction when using Eckstein-Hechler propagator constructor with an attitude law.
Matrixes multiplications in the CovarianceUtils class are now well coded.
TankProperty and PropulsiveProperty did not need the name of the part in the constructor.
IsisSunPointing class: in the getAttitude() method, the xSun vector is normalized.
Performance problems for multithreading due to a bad use of synchronization.
Correction of the getDate() method in the GalileoAlmanacParameters class, considering GST epoch as 1999/08/22 0h0mn0s UTC.
Correction of the equivalent maximal inertia in the AbstractIsisSpinBiasSlew class taking into account all the wheels.
Anomaly when reading some TLE.
Useless computations in the Rotation class constructor.
Improvement of the HelmholtzPolynomial.computeHelmholtzPolynomial() method: Balmino model is 30% more rapid.
SI value for hydrogen mass
Error messages for MultiNumericalPropagator and NumericalPropagator classes have been modified.