A bunch of minor changes:
- Named btn_ok in the Glade file correctly (was "button3").
(The rest of these are from edit_area.py)
- Added docstring for EditArea.on_surface_form_selected.
- Fixed EditArea.select_root() to automatically select its part of speech.
- Added btn_ok as a widget.
- Created and connected empty handlers for buttons' clicked events.
- Moved all signal connections to a new method __connect_signals.
- Moved EditArea.__match_{pos,root} back to "METHODS" part of the class, seeing
as it's not really event handlers.
git-svn-id: http://translate.svn.sourceforge.net/svnroot/translate/src/trunk/spelt@7552 54714841-351b-0410-a198-e36a94b762f5