Proof-Tutorials: support for passing input objects to runProof

It is now possible to pass as 4th argument a list of objects to be added to the input list to further control
the PROOF behaviour:

   root [] TList *ins = new TList
   root [] ins->Add(new TParameter<Int_t>("MyParm", 3))
   root [] runProof("simple",0,4,ins)

the content of 'ins' will then be copied to the input list before processing.