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make TMVA NN in PrForward stateless (for master)

Paul Seyfert requested to merge pseyfert_StateLessPrForwardMLPs_formaster into master

(copy&paste from !590 (merged)) The codegenerated TMVA MLP reader classes have some float *fWeights[5] to store the intermediate node values during the network evaluation. These are not threadsafe. Once making them local c-arrays std::arrays in the evaluation function helgrind is happy (test done in

to be done/note:

  • check with @raaij that was the only reason for the mutex in the future branch
  • check if I didn't break the computation
  • remove mutex from PrForwardTool in future branch once this is made its way there
  • check that the removal of two unused networks is okay for master

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