[SotLoaderBasic] parseOptions does not call initialization anymore.

  - initialization() should be called after initializeRosNode() since the
    former stores ROS parameter "/robot_description" in
    sot::sgl_map_name_to_robot_util (sot/tools/robot-utils.cpp), while the
    second sends the python prologue to the interpreter, and the prologue
    needs the parameter server to contain key "/robot_description".