Adding SLEPc solver for k-eigenvalue problems #646
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I am not a SLEPc expert, but this looks good to me.
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This PR adds a SLEPc k-eigenvalue solver. Due to the number of STL vec <-> PETSc vec copies, this PR should not be merged until after the refactoring of LBS vecops. We may want to guard this solver and make this experimental for the time being.
Due to the way SLEPc internally scales/normalizes, we can't use the EPS eigenvalue directly. Instead, we need to extract the eigenvector and compute the k-eigenvalue after EPS converges.
Closes #180