I'm getting a floating point exception in the eigen estimator for cheby on the 
2nd solve of ex56 (you need to uncomment the define of TwoSolve) when I use sor 
PC (runex56 uses jacobi so you need to change that).  I see this on Cray and my 
Mac.

I also found that the eigen estimator was called before the first solve, and 
worked fine, but I set the eigen values so I don't want it computing eigen 
values.

I can understand cheby being the eager beaver and recomputing eigen values when 
I set a new matrix, but this not the semantics that I prefer.

So there seem to be three issues:

1) seems the floating point exception.  This only happens with a non-debug 
build.  I'm also using 64 bit indices.

2) computing eigenvalues even though I set them.

3) I would like to tell cheby not to recompute eigenvalues.

Mark


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