new r.in.hdf

[Bill Brown]

I just put an updated version of r.in.hdf on moon in grass/incoming .

This latest version adds features to correctly import NASA AVHRR
data & other HDF format data that uses the HDF calibration feature.

It also allows you to list the contents of the HDF file, and select
random datasets from the file for importing to GRASS. (With the old
version, you had to either import only the first dataset or all datasets.)

This version also writes some of the HDF annotation & label info to
the GRASS history file.

Bill B.