RigidBodyControl and VehicleControl don't clone linear factors

The following test fails in master jme3-bullet because the controls are incompletely cloned. It'll be tricky to fix this because the control classes are common (to both jme3-bullet and jme3-jbullet) and jme3-jbullet doesn't implement getLinearFactor().

package jme3test.bullet;

import com.jme3.app.SimpleApplication;
import com.jme3.bullet.collision.shapes.CollisionShape;
import com.jme3.bullet.collision.shapes.SphereCollisionShape;
import com.jme3.bullet.control.RigidBodyControl;
import com.jme3.bullet.control.VehicleControl;
import com.jme3.bullet.objects.PhysicsRigidBody;
import com.jme3.math.Vector3f;
import com.jme3.util.clone.Cloner;

/**
 * Test cloning of linear factors on RigidBodyControl and VehicleControl.
 *
 * @author Stephen Gold sgold@sonic.net
 */
public class TestIssueXXX extends SimpleApplication {

    public static void main(String[] args) {
        TestIssueXXX app = new TestIssueXXX();
        app.start();
    }

    @Override
    public void simpleInitApp() {
        CollisionShape shape = new SphereCollisionShape(1f);
        /*
         * RigidBodyControl
         */
        RigidBodyControl rbc = new RigidBodyControl(shape, 1f);
        rbc.setLinearFactor(new Vector3f(0.14f, 0.15f, 0.16f));
        verifyParameters(rbc);
        RigidBodyControl rbcClone = (RigidBodyControl) Cloner.deepClone(rbc);
        verifyParameters(rbcClone);
        /*
         * VehicleControl
         */
        VehicleControl vc = new VehicleControl(shape, 1f);
        rbc.setLinearFactor(new Vector3f(0.14f, 0.15f, 0.16f));
        verifyParameters(vc);
        VehicleControl vcClone = (VehicleControl) Cloner.deepClone(vc);
        verifyParameters(vcClone);

        stop();
    }
    // *************************************************************************
    // private methods

    private void verifyParameters(PhysicsRigidBody body) {
        Vector3f f = body.getLinearFactor();
        assert f.x == 0.14f : f;
        assert f.y == 0.15f : f;
        assert f.z == 0.16f : f;
    }
}

Start with RigidBodyControl, VehicleControl, and PhysicsRigidBody, then compare their cloning behavior in jme3-bullet and jme3-jbullet, where getLinearFactor() is not implemented in the latter. Run the supplied TestIssueXXX case and verify that deep-cloned controls preserve all three linear-factor values in both implementations.