Fix NonHydrostaticTimeIntegrator2D for projection of solutions with adaptivity #374
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…daptivity The advance method of a timeintegrator should always advance from the solved-for-fields, which are the same fields that will contain the solution at the end of the timestep _after_ calling advance(). This is because this is the only field(s) that the "user" of a time integrator has control over, and the user may want to adjust/overwrite/project (for adaptivity) at the end of a timestep and expect the timestepper to advance from the adjusted values in the next timestep. Thus, if a time-integrator stores some copy of a "solution_old" it should be set at the _beginning_ of advance() to the current solution, rather than at the end.
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The advance method of a timeintegrator should always advance from the solved-for-fields, which are the same fields that will contain the solution at the end of the timestep after calling advance(). This is because this is the only field(s) that the "user" of a time integrator has control over, and the user may want to adjust/overwrite/project (for adaptivity) at the end of a timestep and expect the timestepper to advance from the adjusted values in the next timestep.
Thus, if a time-integrator stores some copy of a "solution_old" it should be set at the beginning of advance() to the current solution, rather than at the end.