added set_log_levels for all levels
added operator== and operator!= for type_info_wrapper, new typedefs and metafunctions for points and point containers
fix in is_convertable: types are always convertable to themself
There is no PLC in 2D any more, adapted to brep_*_mesh, adapted seed point locator to provide point list (neighbor search)
new example: seed point locator 1d, adaption to brep_*_mesh