more meetingpane functionality
Merge branch 'master' of https://github.com/Destitude2112/scheddar

# By Robert Volgman (2) and atutino (2)
# Via Robert Volgman
* 'master' of https://github.com/Destitude2112/scheddar:
  Fixed group and person deletion
  Now cannot add duplicate groups, popup notification if you try
  Now prevents creating people with same name, gives a popup box
  Added deleting functionality