Work on the Tutorial: Extending the chapter about tree and list widgets.
Issue #9: Correcting a bug. It is the function gtk-file-chooser-get-filename
and not gtk-file-chooser-filename.
Correcting a typo
Work on the API documentation for GdkWindow
Work on the API documentation for GType
Some work  on example code.
Work on the API documentation of the GTK library
Removing the file gtk.generated-classes.lisp
Some work on the testsuite