TMVA api change in ROOT 6.08+
this is somehow what needs to be done: https://github.com/lcfiplus/LCFIPlus/commit/cb7cdcbacb3672c8006653d4f87f0449d81e068a
this is somehow what needs to be done: https://github.com/lcfiplus/LCFIPlus/commit/cb7cdcbacb3672c8006653d4f87f0449d81e068a