rem: c.writeEntry( e.key, b->isChecked() );
add: Q_ASSERT( g->count() == e.numItems ); c.writeEntry( e.key, e.items[ g->id( g->selected() ) ].key );
context:   void save( QCheckBox * b, KConfigBase & c, const BoolConfigEntry & e ) {    Q_ASSERT( c.group() == e.group );    c.writeEntry( e.key, b->isChecked() );  }