Add the ability homeomorphism from simplex to cube

[microprediction]

Add the ability homeomorphism from simplex to cube so every method defined on the latter works on the former without the need for the additional sum( )=1 constraint.

[microprediction]

https://math.stackexchange.com/questions/1896894/bijective-map-beween-the-unit-simplex-and-the-unit-hypecube/4637880#4637880