improved shade.rel.sh

I have put an "improved" version of shade.rel.sh in "incoming". This
allows you to specify a "vertical exaggeration factor" for those times when
your cell values are not in the same units as your map units (eg lat-long,
gravity data, rainfall, etc)

Simon Cox

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Dr Simon Cox __ \
CSIRO Exploration & Mining ,~' L_|\ Australian
39 Fairway, PO Box 437, ;-' \ Geodynamics
Nedlands, WA 6009 Australia ( \ Cooperative
      Phone +61 9 389 8421 + ___ / Research
      Fax +61 9 389 1906 L~~' "\__/ Centre
s.cox@dem.csiro.au W
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