DEV: Add the possibility to specifiy a minimum number of iterations for inner (linear) solvers in Newton's method #343
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This PR introduces the parameter
min_inner_iter
to the Newton's method, which can be used to specify the minimum amount of iterations a linear solver (inner solver) has to perform regardless of termination criteria.Note, that this feature depends on PETSc >= 3.20 - so it only makes sense to merge this, once support for PETSc 3.20 exists (see #320)
Closes #290