Add an interface for PETSc SNES #447
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This means, that now all PETSc solver options should be able to work Also fixes some notational bugs noted with mypy
Make snes solve the default nonlinear solver for the p-Laplacian projection of the shape gradient
Fixes a small bug
Also removes some "inner" parameters from the picard iteration
This allows users to choose between the "old" backend (custom newton solver implemented by hand) and the new PETSc SNES backend. The old behavior can be obtained with :ini:`backend = cashocs`, the new one with :ini:`backend = petsc`. The default is backend = cashocs for compatibility reasons.
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This PR adds a cashocs interface for using PETSc's SNES to solve nonlinear equations.
In the optimization problem, users can choose between the old setting (custom newton solver) and the new one with the parameter
backend(which can becashocsorpetsc). The default is the old system for compatibility reasons.Closes #441
Closes #423