[tomboy-list] Checkbutton patch

[Joseph Method]

Here is some proof of concept code, not ready for inclusion, for
adding checkbuttons to Tasks. It works alongside the TasksNoteAddin as
a separate addin that responds to the changes it makes to the buffer.
It's very rough at the moment, but the checkbuttons are toggleable.
Mainly I am looking for guidance on what to do with buffer access
conflicts and the OnInsertText callbacks used in all the Plugins and
Addins.  To get this code to work I made many of the NoteWatchers,
etc. rely on acquiring the cursor instead of the callback iter, and I
still get many many 'Invalid text buffer iterator' in the console.

-- 
-J. Method
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