2018-04-05 Rec v23r1

This version uses Lbcom v22r0p1, LHCb v44r1, Gaudi v29r3 and LCG_93 with ROOT 6.12.06

This version is released on `2018-patches` branch.

Built relative to Rec v23r0, with the following changes:

Bug fixes

• Suppress a maybe unitialised variable warning in StandaloneMuonRec, !979 (@cattanem)
  Cherry picked from MR !971 in master

Code modernisations and cleanups

• Remove PGPrimaryVertex from Rec for LHCBGAUSS-1218, !963 (@adavis) [LHCBGAUSS-1218]
  Moved to LHCb/Sim/SimComponents

Monitoring changes

• TrackVertexMonitor: make NumTracksPV a Property, !965 (@gdujany)
  Needed to be able to configure it in Alignment monitoring