generate rootmap for reflex dictionaries

Kevin Pedro requested to merge rootmap into Run2_2017

The resulting rootmap can then be used with hadd or ROOT macros to ensure correct streamer info for our tree branches.

NB, the rootmap is generated with the name TreeMakerReflex_xr.rootmap, but ROOT may expect the name TreeMakerReflex.rootmap instead (to match the shared library). This can be fixed by hand.

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