Replaced AdditionalEquations by AdditionalDerivativesProvider.

src/changes/changes.xml

src/design/available-propagators-class-diagram.puml

src/design/dsst-partial-derivatives-class-diagram.puml

src/design/partial-derivatives-class-diagram.puml

...n/java/org/orekit/orbits/CR3BPDifferentialCorrection.java

.../java/org/orekit/propagation/AdditionalStateProvider.java

.../org/orekit/propagation/FieldAdditionalStateProvider.java

src/main/java/org/orekit/propagation/Propagator.java

...kit/propagation/conversion/AbstractPropagatorBuilder.java

.../orekit/propagation/conversion/DSSTPropagatorBuilder.java

...it/propagation/conversion/NumericalPropagatorBuilder.java

...propagation/integration/AbstractIntegratedPropagator.java

...ropagation/integration/AdditionalDerivativesProvider.java

...g/orekit/propagation/integration/AdditionalEquations.java

...t/propagation/integration/AdditionalEquationsAdapter.java

...gation/integration/FieldAbstractIntegratedPropagator.java

...ation/integration/FieldAdditionalDerivativesProvider.java

...kit/propagation/integration/FieldAdditionalEquations.java

...pagation/integration/FieldAdditionalEquationsAdapter.java

...gation/numerical/AbsolutePartialDerivativesEquations.java