auto node creation code added for student mode
Merge branch 'master' into pradeep
Comments on autocreation work in progress:
Used different method of hooking to drawModel.addNode(); see
  colorNodeBorder().
Maybe updateNodeLabel() should be in draw-model since this
  has to do with the drawing canvas?
See comments in autocreateNodes()
auto creation after code review - tested student mode
automatic node creation for author mode
Merge branch 'master' into pradeep
Add some comments about sending new nodes to PM and
removing if(...) in autoCreateNodes.  Fix whitespace.