The Grid is define on a N-dimensional set of integer coordinates.
The maximum dimension is eight, and indexes in this space make use of the Coordinate class.
The coordinate class shares a similar interface to std::vector<int>, but contains all data within the
object, and has a fixed maximum length (template parameter).
Example:
const int Nd=4;
Coordinate point(Nd);
for(int i=0;i<Nd;i++)
point[i] = 1;
std::cout<< point <<std::endl;
point.resize(3);
std::cout<< point <<std::endl;
This enables the coordinates to be manipulated without heap allocation or thread contention,
and avoids introducing STL functions into GPU code, but does so at the expense of introducing
a maximum dimensionality. This limit is easy to change (lib/util/Coordinate.h).