Fix design problem multi_shift #147
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Changes of the pull request:
Fix design problem with$\rho$ values for preconditioned FGMRES, save the values as an instance variable.
multi_shift_fomandmulti_shift_fgmres. Instead of returningSort shifts in
multi_shift_fgmres. Sorting shifts in GMRES can improve convergence, see e.g. https://doi.org/10.1137/S1064827596304563.Smaller restart size for tests of
multi_shift_fomandmulti_shift_fgmres. By using a smaller restart size, shifts can converge at different iterations. This change allows for testing the handling of already converged shifts.