fix bugs with API: re-add date filtering, revert assumption of last month by default, re-add instance variables, fix other minor bugs
fix bugs with API: re-add date filtering, revert assumption of last month by default, re-add instance variables, fix other minor bugs

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