- recognize empty con/destructors in foo.cc and delete them inside foo.hh
	- Ask first / Expand
- recognize empty class derivations in foo.hh and replace them by typedefs
	- Ask first / Expand
- recognize missing [non-empty] con/destructors in foo.cc which are in
  foo_glade.cc
- recognize missing member functions (e.g. signals), add them
- recognize missing connects in constructors, add them
- recognize missing class declarations, add them

Idea:
- show all actions as yes/no boxes, select, then press Go