[astro] hessian code updated

[Travis Desell]

I've updated the code for the hessian and it looks like it's working  
(the hessian is symmetric at any rate).  The changes are in CVS.

Let me know how it works out.

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Travis Desell
<deselt @ cs.rpi.edu>
1-518-867-1054
Worldwide Computing Laboratory ( http://wcl.cs.rpi.edu/ )
MilkyWay at Home ( http://milkyway.cs.rpi.edu/ )
Rensselaer Polytechnic Institute, 110 8th Street, Troy NY 12180, USA
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