Fix eigensolver preconditioning

[aprokop]

From this comment:

Hey @aprokop , I've got everything working and tested except for a failing anasazi solve in the 4-processor eigen_handle tests (both C++ and Fortran wrapper):

p=0: *** Caught standard std::exception of type 'std::logic_error' :

 ../src/fortrilinos_hl/eigen_handle.cpp:140:

 Throw number = 1

 Throw test that evaluated to true: !(r == 0)

 Error!

The failing line is after

    Anasazi::ReturnType r = solver_->solve();

I tried updating the MueLu solver verbosity to see if that would help shed light on the error, but no luck there.

[aprokop]

The cause is completely unclear. Running the test without preconditioning works. However, using either Ifpack2 or MueLu does not converge.

[sethrj]

Is the fact that it passes on a single processor surprising?

[aprokop]

Is the fact that it passes on a single processor surprising?

Kinda.

[sethrj]

This is at least better-understood and worked around in #282. The check for convergence has been removed in favor of an accessor on the solved values.