added line to convert User to User.id on plan role assignment functions
added line to convert User to User.id on plan role assignment functions

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