added Object.dataroot, Root.dataroot property
replaced Object.root() -> Object.dataroot
replaced Root.root() -> Root.dataroot
replaced *.GetApp() -> *.app
replaced *.GetParent() -> *.parent

deprecated functions in Object, Root, Application:
    def root(self):
    def GetRoot(self):
    def GetApp(self):
    def GetParent(self):
cleanup