add destructor to xyz.h, relates to [bugs:#176] Crash on quit of GUI app or saga_cmd when exiting on Mac
io_grid, xyz.cpp: add destructor (fix r1951 which broke the compilation under windows)
saga_api, csg_vector: improved performance for dynamic array growth
grid_tools, mosaicking: (histogram) matching option added
saga_gui: loading and saving projects and data
pj_proj4, module added: create projected lon/lat graticule
saga_gui, maps: graticule option added