Calls to FillBoundaryAux()

[EZoni]

Following up on #1522, this is to remind us that the following call

WarpX/Source/Evolve/WarpXEvolve.cpp

Lines 117 to 120 in bedec34

	#ifndef WARPX_USE_PSATD
	// TODO Remove call to FillBoundaryAux before UpdateAuxilaryData?
	FillBoundaryAux(guard_cells.ng_UpdateAux);
	#endif

seems necessary in order for the NCI corrector (with the FDTD solver) to work correctly with mesh refinement.

In other words, if that call is removed, the CI test nci_correctorMR fails (no NCI mitigation).

However, if the call is removed AND warpx.safe_guard_cells = 1, then the CI test passes.

This suggests that we might be doing something wrong somewhere with the guard cells. Once fixed, it might be eventually possible to remove the call above, leaving only the one added after UpdateAuxilaryData():

WarpX/Source/Evolve/WarpXEvolve.cpp

Lines 121 to 122 in bedec34

	UpdateAuxilaryData();
	FillBoundaryAux(guard_cells.ng_UpdateAux);