Add ROOT monitoring to TwoKs line

The MR adds the ROOT monitoring tools to TwoKs line.

The list of variables that are monitored are:

• chi2trk(pi) for the 4 different pions in the KS0 pair
• p(pi) for the 4 different pions in the KS0 pair
• pt(pi) for the 4 different pions in the KS0 pair
• ipchi2(pi) for the 4 different pions in the KS0 pair
• ip(pi) for the 4 different pions in the KS0 pair
• theta(pipi) cosine of pions opening angle for the two KS0
• DIRA(KS0) for the two KS0
• IP(KS0) for the two KS0
• ip(pi1)*ip(pi2)/ip(KS0) for the two KS0
• pt(KS0) for the two KS0
• chi2vtx(KS0) for the two KS0
• ipchi2(KS0) for the two KS0
• DIRA(KS0) for the two KS0
• eta(KS0) for the two KS0
• m(KS0) for the two KS0
• DOCA(KS0) for the two KS0
• m(KS0KS0) invariant mass of the two KS0
• PV and SV positons separately for the two KS0 candidates
• px, py, pz (KS0) for the two KS0
• event number
• run number

FYI @tevans