support of 1 to 32 bit GRIB data

ChangeLog

doc/tex/variable.tex

prog/cdi.c

src/cdi.h

src/griblib.c

src/stream_cdf.c

src/stream_ext.c

src/stream_grb.c

src/stream_hdf.c

src/stream_ieg.c

src/stream_srv.c

src/vlist.h

src/vlist_var.c