Addition of number of optical hits above a specific threshold to the CRTPMT Data product

[francescopoppi]

As the title suggest, we have applying spcific threhsold requirements to the selection of the Optical Hits above threshold that were outdate (coming from Run1). We need to make this variable a member of the data product os that analyzers can choose their cuts.
Few things need to be done in this order:

1. Addition of the variable: nOpHitOverThreshold to the dataproduct in sbnobj;
2. Addition of the variable: nOpHitOverThreshold to the CAF Standard Record in sbnanaobj;
3. Need to discuss with Trigger experts which threshold conditions make sense for each Run;
4. In icaruscode we need to modify the current producer in order to fill the nOpHitOverThreshold variable;
5. Fill the SR object with the newly included nOpHitOverThreshold.