ui.Go() on GTK+ now reports the reason gtk_init() failed in its error return.
Removed TODO about returning container before connecting signals in sysdata_unix.go; nothing will actually be sent until we show the widgets anyway.
Made Listbox's column autoresizing on GTK+.
Resolved TODOs in listbox_unix.go; also rewrote some related if expressions there to be clearer.
Removed height-for-width TODO from prefsize_unix.go after discussion with Company in irc.gimp.net/#gtk+.
More TODOs.
Removed TODO from gtkcalls_unix.go about gtk_widget_show_all() working on all widgets, not just containers; the documentation explicitly says this.
Cleaned up and got rid of some TODOs in gtkcalls_unix.go.
Cleaned up/removed some TODOs in area_unix.go.