Docu update

src/remap_search_reg2d.cc

@@ -32,6 +32,7 @@ int
 grid_search_square_reg2d_NN(size_t nx, size_t ny, size_t *nbrIndices, double *nbrDistance, double plat, double plon,
                             const Varray<double> &lats, const Varray<double> &lons)
 {
+  // nbrIndices and nbrDistance must have memory for four values!
   int searchResult = 0;
 
   auto tgtCosLat = std::cos(plat);