NewtonSolver(solver, factory) does not work

Modifying Cahn-Hilliard demo to

-solver = NewtonSolver()
+solver = NewtonSolver(LUSolver(), DefaultFactory())

will raise

*** Error:   Unable to access parameter set.
*** Reason:  Parameter set "newton_solver.default" not defined.
*** Where:   This error was encountered inside Parameters.cpp.

so effectively there is no way linear solver object could be accessed before first solve - see this comment on ~~#10~~.

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