Started working on replacing DSFactory by Gradient.

build.xml

pom.xml

...g/orekit/estimation/measurements/AbstractMeasurement.java

.../java/org/orekit/estimation/measurements/AngularAzEl.java

...java/org/orekit/estimation/measurements/AngularRaDec.java

.../estimation/measurements/EstimatedEarthFrameProvider.java

...ava/org/orekit/estimation/measurements/GroundStation.java

.../orekit/estimation/measurements/InterSatellitesRange.java

src/main/java/org/orekit/estimation/measurements/Range.java

...in/java/org/orekit/estimation/measurements/RangeRate.java

...a/org/orekit/estimation/measurements/TurnAroundRange.java

...n/java/org/orekit/estimation/measurements/gnss/Phase.java

...mation/measurements/modifiers/IonosphericDSConverter.java

.../measurements/modifiers/IonosphericGradientConverter.java

...measurements/modifiers/PhaseIonosphericDelayModifier.java

...easurements/modifiers/PhaseTroposphericDelayModifier.java

...measurements/modifiers/RangeIonosphericDelayModifier.java

...urements/modifiers/RangeRateIonosphericDelayModifier.java

...rements/modifiers/RangeRateTroposphericDelayModifier.java

...easurements/modifiers/RangeTroposphericDelayModifier.java