Merge branch 'OneZoomBug'

* OneZoomBug:
  BUG: OneZoom only works on tree loaded from files.
ENH: Deal with wrong input data filtering syntax.
BUG: sync voTreeDropTipWithoutData with voTreeDropTip

There were a couple of bugs that was fixed in voTreeDropTip
but not in voTreeDropTipWithoutData.
Merge branch 'DropTipBug'

* DropTipBug:
  BUG: sync voTreeDropTipWithoutData with voTreeDropTip
  ENH: Deal with wrong input data filtering syntax.