new version of the script which will be used for release validation

Author: emeninno

RelVal/README.md

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+This macro ReleaseValidation.C permits to compare the QC.root output from different passes
+
+
+## Usage
+The input variables which we need to give to the macro are:
+
+- the two QC.root files, with corresponind path
+
+- the Monitor object collection we want to focus on:
+QcTaskMIDDigits;
+DigitQcTaskFV0;
+TaskDigits;
+DigitQcTaskFT0;
+QcMFTAsync;
+ITSTrackTask;
+MatchedTracksITSTPC;
+MatchingTOF;
+ITSClusterTask;
+Clusters;
+PID;
+Tracks;
+Vertexing 
+
+- which compatibility test we want to perform (bit mask):
+1->Chi-square;
+2--> ContBinDiff;
+3 (combination of 1 and 2)--> Chi-square+MeanDiff;
+4-> N entries;
+5 (combination of 1 and 4) --> Nentries + Chi2;
+6 (combination of 1 and 2)--> N entries + MeanDiff;
+7 (combination of 1, 2 and 3)--> Nentries + Chi2 + MeanDiff
+
+- threshold values for checks on Chi-square and on content of bins
+
+- choose if we want to work on the grid or on local laptop (to be fixed)
+
+- tell the script it there are "critical "histograms (the list of names of critical plots has to be written in a txt file), which we need to keep separated from the other histograms. The corresponding plots will be saved in a separated pdf file
+
+
+The macro is currently working only on real data (will be fixed soon)