added the AltkRoot class
added AltkDisplay.root
implemented AltkRoot.add()
added the AltkWindow class
added the display's root window
fixed display opening
added the 'VISIBLE' widget flag
fixed the class_init handlers
Merge branch 'master' into window
removed altk_widget_forall()
Merge branch 'master' into window
added some docs
removed the AltkRoot class
added the window manager
fixed display opening
cleanup display code
added AltkWidget.forall()
added AltkWidget.foreach()