[Rgc_analysis] macro to read the fcup information from the scaler banks

[pilleux at jlab.org]

Dear all,

I can't recall if I shared a similar code already, so let me just share
once and for all a macro, that can be run with clas12root, to read the
scaler banks and get the FCup information.

It can be found here and is documented :
https://github.com/N-Plx/shared_for_RGC

Best, Noémie.