MuDst to picoDst conversion

from Zhenyu's blog:
(1) Run15 pp 200 GeV physics/ssdmb
NO covariant matrix, with BEMC SMD, mtdMatch, y2015c, PicoVtxMode:PicoVtxVpdOrDefault, TpcVpdVzDiffCut:6
(2) Run14 AuAu 200 GeV st_mtd
NO covariant matrix, mtdMatch,y2014a, PicoVtxMode:PicoVtxVpdOrDefault, TpcVpdVzDiffCut:3

proposed:
(1) Run15 pp 200 GeV physics/ssdmb
NO covariant matrix, with BEMC SMD, mtdMatch, y2015c, PicoVtxMode:PicoVtxVpdOrDefault, TpcVpdVzDiffCut:6
(2) Run17 pp 510 GeV st_mtd
mtdMatch, y2017a, PicoVtxMode:PicoVtxVpdOrDefault, TpcVpdVzDiffCut:6, PicoCovMtxMode:PicoCovMtxSkip
(3)AuAu_200_production_2016 (production1) P16ij_SL18f reproduction
with FMS information
(4) Run14 AuAu 200 GeV st_mtd
NO covariant matrix, mtdMatch, y2014a, PicoVtxMode:PicoVtxVpdOrDefault, TpcVpdVzDiffCut:3

Run17 pp500 st_physics stream  - moving to DD storage

 Embedding:
rerun run18 AuAu 27 GeV embedding after fixing the nHits issues