updated logic to unpublish older versions when a version is published
updated logic to unpublish older versions when a version is published

CDLUC3/dmptool,CDLUC3/dmptool,briri/roadmap,briri/roadmap,DMPRoadmap/roadmap,DigitalCurationCentre/roadmap,CDLUC3/dmptool,CDLUC3/roadmap,DMPRoadmap/roadmap,DigitalCurationCentre/roadmap,CDLUC3/roadmap,DMPRoadmap/roadmap,briri/roadmap,CDLUC3/roadmap,CDLUC3/roadmap,DigitalCurationCentre/roadmap,CDLUC3/dmptool