grib cleanup

src/stream.c

src/stream_cdf.c

src/stream_ext.c

src/stream_grb.c

src/stream_grb.h

src/stream_history.c

src/stream_ieg.c

src/stream_int.c

src/stream_int.h

src/stream_record.c

src/stream_srv.c

src/stream_var.c

src/tsteps.c

src/varscan.c