Therion 0.3.3 announce

Hello everybody, therion 0.3.3 is available. The most important changes are * support for surface map (2D) and surface grid (3D) * it's possible do display centreline in 2D map without drawing the scrap (it's enough to include survey in the map command) See the file CHANGES for details. The web page contains screenshots illustrating new features. Best wishes, Martin