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Implementation of DigraphColourRefinement. Takes a digraph and returns a colouring (A list where value at ith position is the colour of the ith node), such that all nodes with the same colour have the same configuration of coloured neighbours. That is, if two nodes have the same colour, they will have the same number of neighbours of colour x, and colour y, etc. DigraphColourRefinement considers out and in neighbours separately.
To be used for testing isomorphism between digraphs. If two digraphs produce two different colouring under Colour Refinement, we can know that they are not isomorphic.
Doesn't currently include optimisation steps.