refactor(prt): simplify face numbering scheme #2586
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Followup on #2546, convert PRT FMI boundary flows from flat array with fixed offset to 2D array with 2nd dimension face numbers. The 2nd dimension uses
icellfacenumbering, the internal "grid-aligned" scheme which shiftsiflowfacenegative top and bottom to the end of an interval from 0 to (grid max lateral cell faces + 2).This simplifies the structured and vertex methods, no more need to compute an offset. Also define constants for top/bottom face numbers in the iflowface numbering scheme.