The "changeCovarianceType" method of the
StateCovariance class can now returns a new identical
StateCovariance instance if desired output
PositionAngle are the same as the ones in the
StateCovariance instance (plus handling of the special case for Cartesian orbit where the position angle does not matter).
Also and maybe most importantly, the
StateCovarianceMatrixProvider now provides the propagated
StateCovariance in the same frame/LOF as the initial
StateCovariance so be careful.