Change PBcount residue-shift to first-residue in demo2
Change PBcount residue-shift to first-residue in demo2

Propagate the change from commit
e37ad153a0b3b152cb027ec0ee278de3770bcf92 to run_demo2.sh.

pierrepo/PBxplore,jbarnoud/PBxplore,HubLot/PBxplore,jbarnoud/PBxplore,pierrepo/PBxplore,HubLot/PBxplore