The previous fix for the  long suggestion lists for the combobox would be overlapped by the footer had the following issue:
The previous fix for the  long suggestion lists for the combobox would be overlapped by the footer had the following issue:

  - long  lists pushed everything down below it on the page rather than covering over items.

This fix makes the following changes:
  - the css selector ".combobox-suggestions" has position reverted back to "position:absolute"
    (as the change "position:static" caused the issue)
    and z-index increased to 1100 (as z-index for footer is 1030) to appear above footer;
  - replaced css selector "#footer-navbar" with "footer" for sticky footer to work correctly with above changes.

Issue #1300

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