Maps values from the global vector to a global vector in the natural ordering. Must be preceded by
Neighbor-wise Collective on da
l - the global values in the natural ordering
The global and local vectors used here need not be the same as those
DMDACreateNaturalVector(), BUT they
must have the same parallel data layout; they could, for example, be
obtained with VecDuplicate() from the
DMDA originating vectors.