hippylib/hippylibx

Fix the implementation of InexactNetwonCG + Trust Region

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This branch of the code was never tested and does not run.

One simple way to do this is to replace the in-house CGSolverSteihaug with a petsc4py.PETSc.KSP of type "stcg"

See https://petsc.org/release/manualpages/KSP/KSPSTCG/