Memory Limitations

[Nucs]

Allocation currently supports up to 2^32 bytes due to using int and not IntPtr and long.

[Nucs]

Unit test

[TestMethod]
public void MyTestMethod()
{
    NDArray x = np.zeros(new Shape(600, 1000, 1000), np.float32);
}

[Nucs]

Ported UnmanagedMemoryBlock and ArraySlice to use long in commit 539683f .
Next is to port Shape to use long and all the algorithms with it. Mainly refactoring job