Got rid of some obsolete code and improved comments
Bugfix: Make sure that only all ancestor nodes are expanded, but not the child node we want to reveal
Bugfix: Avoid double populating due to race conditions, by not only looking at isPopulated, but also at isLoading
Bugfix: Suppress node population while trying to reveal a node (due to double click in object view) - because we know that node gets selected, and thus populated in the next line anyway. This is a measure to avoid multiple populateNode: calls.