[FIX] mrp: same products in different sub-phantom-BoMs should be allowed

Let's consider 4 products P0, P1, P2 and P3 where:

- P0 depends on P1, P2 and P3
- P1 depends on P2 and P3
- P2 depends on P3

NB: "x depends on y" means that there is a phantom BOM for x where
y is in a line.

With this example, before the fix, when creating a MO for P0,
the function "explode" raised a user error saying that there
was a recursion error.

Even if in this case there was no recursion.

Now to check if there is a recursion, a graph of the dependencies of
the bom is created while exploding the boms and a function "isCyclic"
is applied on the graph to verify that there is no cycle which means
no recursion in the dependencies.

The algorithm was taken from this site: http://www.geeksforgeeks.org/detect-cycle-in-a-graph/

opw:745453

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