new signatures of the VehicleRoutingAlgorithms.createAlgorithm method th...

...at allow one to specify the nThreads with AlgorithmConfig algorithmConfig or URL configURL

I know there is a bunch of this method signature already.
I think it can be helpful to have them.

I am sorry, I did not write any test case to prove it works. In fact I did not even test them in my project yet. But all the jsprit-core test cases are ok.