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[Anders Logg <logg@xxxxxxxxx>]

Do we need the following functions in KrylovSolver or can we remove
them?

It should be enough to specify the type of solver and preconditioner
in the constructor. I think it's good if we can minimize the number of
functions in the interfaces, in particular any setFoo() functions.

  /// Set Krylov method type
  void setType(const Type solvertype);

  /// Set PETSc preconditioner type
  void setPreconditioner(const Preconditioner::Type preconditionertype);

  /// Set preconditioner
  void setPreconditioner(Preconditioner &pc);

/Anders