Fixed deprecations.

src/main/java/org/orekit/forces/gravity/potential/ConstantSphericalHarmonics.java

@@ -146,6 +146,7 @@ class ConstantSphericalHarmonics implements RawSphericalHarmonicsProvider {
     }
 
     /** {@inheritDoc} */
+    @Deprecated
     public double getOffset(final AbsoluteDate date) {
         return 0.0;
     }

src/main/java/org/orekit/forces/gravity/potential/PulsatingSphericalHarmonics.java

@@ -141,6 +141,7 @@ class PulsatingSphericalHarmonics implements RawSphericalHarmonicsProvider {
     }
 
     @Override
+    @Deprecated
     public RawSphericalHarmonics onDate(final AbsoluteDate date) {
         //raw (constant) harmonics
         final RawSphericalHarmonics raw = provider.onDate(date);

src/main/java/org/orekit/forces/gravity/potential/RawSphericalHarmonicsProvider.java

@@ -54,15 +54,6 @@ public interface RawSphericalHarmonicsProvider extends SphericalHarmonicsProvide
 
     }
 
-    /** Get the offset from {@link #getReferenceDate reference date} for the harmonics.
-     * @param date current date
-     * @return offset between current date and reference date if there is a reference
-     * date, or 0.0 if there are no reference dates (i.e. if {@link #getReferenceDate}
-     * returns null)
-     * @since 11.1
-     */
-    double getOffset(AbsoluteDate date);
-
     /**
      * Get the raw spherical harmonic coefficients on a specific date.
      * @param date to evaluate the spherical harmonics

src/main/java/org/orekit/forces/gravity/potential/SphericalHarmonicsProvider.java

@@ -74,7 +74,7 @@ public interface SphericalHarmonicsProvider extends TideSystemProvider {
      * @return offset between current date and reference date if there is a reference
      * date, or 0.0 if there are no reference dates (i.e. if {@link #getReferenceDate}
      * returns null)
-     * @deprecated as of 11.1, this method has been moved to {@link RawSphericalHarmonicsProvider}
+     * @deprecated as of 11.1, this method is only called by deprecated methods
      */
     @Deprecated
     double getOffset(AbsoluteDate date);