[EM] Floyd-Warshall algorithm - variations

[stephane.rouillon at sympatico.ca]

Dear Ernest,

> Yes, Stef, time to finish that thesis, 
> all this math really is the same.

>From an algorithmic point of view, yes.
But from a behaviour and result point of view,
"min" and "+" produce very different things...

And yes Markus and Mike promote both "min" and
"winning votes". They just love to argue "for fun".

Stephane