#29 Passing Double to Reader::AddVariable()

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As e.g. the LHCb software is writing Doubles into TTrees, it would be handy if the TMVA::Reader method AddVariable would accept Doubles as input parameter additionally to Float or Int.

To avoid problems with that, its currently necessary to make local copies of every variable in the event loop, which gives a huge overhead and is probably just another possible weak point of the code.