Deal with new ritz values in 1:nlock range #117
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ArnoldiMethod.jl did not seems to deal with repeated eigenvalues, where the convergence behavior is such that the second converges slower than the first, meaning we may need to add it to the locked vectors later.
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ArnoldiMethod.jl did not deal with repeated eigenvalues well.
The typical convergence behavior is that the second converges slower / after
the first, so that when sorted by, a not yet converged eigenvalue may pop up in
the range 1:nlock. I guess previously they all converged nicely in order.