Merge branch 'issue-514' into develop

src/changes/changes.xml

...in/java/org/orekit/forces/BoxAndSolarArraySpacecraft.java

src/main/java/org/orekit/forces/drag/DragSensitive.java

src/main/java/org/orekit/forces/drag/IsotropicDrag.java

.../forces/radiation/IsotropicRadiationCNES95Convention.java

...rces/radiation/IsotropicRadiationClassicalConvention.java

...forces/radiation/IsotropicRadiationSingleCoefficient.java

.../java/org/orekit/forces/radiation/RadiationSensitive.java

...ava/org/orekit/forces/BoxAndSolarArraySpacecraftTest.java

...g/orekit/forces/radiation/SolarRadiationPressureTest.java