selgridcell: added support for GENERIC grids.

src/Selbox.cc

@@ -241,7 +241,7 @@ gengridcell(int gridID1, size_t gridsize2, long *cellidx)
 
   if (gridtype == GRID_CURVILINEAR) gridtype = GRID_UNSTRUCTURED;
 
-  if (gridtype == GRID_UNSTRUCTURED)
+  if (gridtype == GRID_UNSTRUCTURED || gridtype == GRID_GENERIC)
     gridID2 = gridCreate(gridtype, gridsize2);
   else
     return gridID2;

src/Selgridcell.cc

@@ -45,6 +45,7 @@ genindexgrid(int gridID1, size_t gridsize2, long *cellidx)
 
   int gridID2 = -1;
   if (gridtype1 == GRID_UNSTRUCTURED || gridtype1 == GRID_CURVILINEAR) gridID2 = gengridcell(gridID1, gridsize2, cellidx);
+  else if (gridtype1 == GRID_GENERIC && gridInqYsize(gridID1) == 0) gridID2 = gengridcell(gridID1, gridsize2, cellidx);
 
   if (gridID0 != gridID1) gridDestroy(gridID1);