eigenvalue/eigenvector calculations

[Paul Gilbert]

> was cross-checking my results in R and came up with the following
>peculiar behaviour.  If you use only.values = TRUE in eigen, you get
>noticeably different eigenvalues and I don't think it is just a matter

This might be related to the problem (bad values from eigen) I reported a couple
of weeks ago. I think it was tracked down to a problem in the header files. As I
understand it, the bug has been around for awhile,  but may not always bite -
unless you're using a snapshot where it might be fixed. (I've reverted to 0.63.3
as it didn't seem to cause me a problem there.)

Paul Gilbert

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