* this is enough to support the gtk-demo.py shell
* TreeStore and ListStore allow passing in as an argument list
  of either python or GLib types to the constructor as a description
  of the columns in the model
* TreeStore and ListStore override the append method, allowing
  the application developer to send in a list of column values
  for one row in the model.  Unlike the append in C which
  just returns an iter that you can then add data to,
  this append actualy appends data in one step
* TreeViewColumn overrides the constructor to allow the adding
  of attributes and a cell renderer when constructing the
  column

https://bugzilla.gnome.org/show_bug.cgi?id=620405