BlockRange(const int extent, Dimension dim)Creates a block-distributed range of extent extent and kernel dim. The block size is
(extent + dim.size() - 1) / dim.size()
The constructed range is a template range.
BlockRange(const int extent, Dimension dim,
const int wlo, const int whi)
Similar to the constructor above, but arrays constructed with this
range (or its subranges) have ghost regions of width wlo, whi
at the upper and lower edges of each block of the range.