pygubu tkinter ui def file
view stub aa-control
restructure to MVC form
refactor imports
fix pygubu buttons; rename aa-control to app.py

takefocus=true property on buttons is not correct; buttons won't
press when the dialog has the focus (but will if you when dialog
does not have focus); removed the takefocus property for each control.
isolate controller activity in ServerController class
add runnable stub at top level
ignore emacs backups