Release stack for Brunel v55r5 on run2-patches, for Reco19

Brunel release (on run2-patches) for reprocessing of Run2 pHe and PNe smog datasets. It is proposed to call the processing pass Reco19.

@masmith @chlucare FYI

Release checklist (to be filled by the shifter)

• release build validation (to be checked with the MR author)
• RPMs deployment
• CVMFS installation
• web pages update