Raphael Lehner issues

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                                            Raphael Lehner

Fix design problem multi_shift

Changes of the pull request: - Fix design problem with `multi_shift_fom` and `multi_shift_fgmres`. Instead of returning $\rho$ values for preconditioned FGMRES, save the values as an instance variable. - Sort...

Fix fom

Calculation of Krylov basis after restart was wrong. See, e.g., vector $v_1$ of ALGORITHM 6.5 of [https://www-users.cse.umn.edu/~saad/IterMethBook_2ndEd.pdf](url). This can be seen by running ```python import gpt as g # load...