Hlt2 Monitoring pi0 to gamma gamma with calo only reco

To be tested together with MooreOnline!133 (merged)

Adds:

• Monitoring line Hlt2MonitoringPi0Line that creates a histogram of pi0 candidates reconstructed from two photons. See details at the end.
• make_calo_only_reconstruction options in hlt2_global_reco

Used on real data with only Calo information available.

Todo:

• the persistency is currently modified manually not to require charged protoparticles and muon and RICH PID, which are not available in the calo-only reconstruction. This needs a proper fix. Update: fixed by !1589 (merged)

Needs !1589 (merged)

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Information on Hlt2MonitoringPi0Line : Current cuts:

cut	value
photon_pT	250 MeV
pi0_pT	1400 MeV

Tested on Upgrade MinBias:

LHCb__Phys__ParticleMakers__Phot... INFO Number of counters : 3

Counter	#	sum	mean/eff^*	rms/err^*	min	max
"Confidence Level"	167307	16557.42	0.098964	0.15984	0.0011237	0.92012
"Created photons"	226907
"Selected photons"	2000	167307	83.653	41.451	0.0000	184.00

TwoBodyCombiner INFO Number of counters : 6

Counter	#	sum	mean/eff^*	rms/err^*	min	max
*"# passed"	2000	1578	( 78.90000 +- 0.9123568)%
*"# passed CombinationCut"	3369695	18147	(0.5385354 +- 0.003986936)%
*"# passed CompositeCut"	18147	18147	( 100.0000 +- 0.000000)%
*"# passed vertex fit"	18147	18147	( 100.0000 +- 0.000000)%
"Input1 size"	2000	101829	50.914
"Input2 size"	2000	101829	50.914