improve NeffFinder

Kevin Pedro requested to merge github/fork/kpedro88/Run2_2017_V17 into Run2_2017_V17

Store the NeffFinder results in a histogram (easier to track than log files).

The output ROOT file from NeffFinder is now called NeffInfo_.... The histogram with neff info is also called NeffInfo_.... The TrueNumInteractions_... histogram is also present in that file.

The four bins in the NeffInfo_... histogram correspond to neff (pos-neg), pos, neg, and tot (pos+neg).

I confirmed that the content in the histogram is the same as what would return after aggregating the log files.

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