Work In Progress in using flatten arrays to gravity fields;

src/main/java/org/orekit/errors/OrekitMessages.java

.../forces/gravity/potential/ConstantSphericalHarmonics.java

.../org/orekit/forces/gravity/potential/EGMFormatReader.java

...n/java/org/orekit/forces/gravity/potential/Flattener.java

...org/orekit/forces/gravity/potential/GRGSFormatReader.java

.../orekit/forces/gravity/potential/GravityFieldFactory.java

...rg/orekit/forces/gravity/potential/ICGEMFormatReader.java

...va/org/orekit/forces/gravity/potential/PiecewisePart.java

...forces/gravity/potential/PiecewiseSphericalHarmonics.java

...forces/gravity/potential/PotentialCoefficientsReader.java

.../org/orekit/forces/gravity/potential/SHMFormatReader.java

...ces/gravity/potential/SecularTrendSphericalHarmonics.java

...rekit/forces/gravity/potential/TimeDependentHarmonic.java

...ces/assets/org/orekit/localization/OrekitMessages_da.utf8

...ces/assets/org/orekit/localization/OrekitMessages_de.utf8

...ces/assets/org/orekit/localization/OrekitMessages_el.utf8

...ces/assets/org/orekit/localization/OrekitMessages_en.utf8

...ces/assets/org/orekit/localization/OrekitMessages_es.utf8

...ces/assets/org/orekit/localization/OrekitMessages_fr.utf8

...ces/assets/org/orekit/localization/OrekitMessages_gl.utf8