major update to the EchoMap function, recoded everything

- EchoMap calculates the geometrical response effects and
  passes the results to EchoMap_makelc by default
- qualifier 'reproment' allows to skip calling the lightcurve
  creation and the geometrical response is returned instead
- qualifier 'powRedist' defines the power redistribution
  function of the surface elements
- qualifier 'reponse' defines the response function of the
  surface on an incoming power peak
- incredible speed up (~factor 50-80)