[Lapack] dggev fails on non-singular system

[Sven Hammarling]

Dear Patrick,

Thank you for your problem report.  I can confirm that I get the same 
failure.

It is hoped to have improved, more efficient, versions of the 
generalized nonsymmetric solvers in a future release, but in the 
meantime we aim to look at this specific problem.  It does seem possible 
that the exceptional shift strategy needs some work.

Thanks you again.

Sven Hammarling.