Updated Newton solver to optionally print diagnostics output; to use step size convergence test instead of residual-based convergence test.
Updated Newton solver to optionally print diagnostics output; to use step size convergence test instead of residual-based convergence test.

liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials