Remove useless configuration flag.

src/main/java/org/orekit/rugged/refraction/AtmosphericRefraction.java

@@ -39,12 +39,6 @@ public abstract class AtmosphericRefraction {
      */
     private boolean mustBeComputed = true;
 
-    /** Flag to tell if we must compute the correction (for direct location) with an optimization grid.
-     * By default: optimization is not set up.
-     * @since 2.1
-     */
-    private boolean isOptimized = false;
-
     /** The current atmospheric parameters.
      * @since 2.1
      */
@@ -119,14 +113,6 @@ public abstract class AtmosphericRefraction {
         return mustBeComputed;
     }
 
-    /** Tell if the computation (for direct location) must be optimized.
-     * @return true if computation must be optimized; false otherwise
-     * @since 2.1
-     */
-    public boolean isOptimized() {
-        return isOptimized;
-    }
-
     /** Configuration of the interpolation grid. This grid is associated to the given sensor,
      * with the given min and max lines.
      * @param sensor line sensor