1.27.1 (unstable):

* Avoid use of deprecated gtkmm/GTK+ API in Glade files.
  For instance, GtkAlignment, and stock items.
  (Murray Cumming, Piotr Drąg)
* Adapt to recent Gtk::Builder child-widget ref-counting fixes in gtkmm.
  (Murray Cumming)
* Avoid new GTK+ warnings about dialogs without transient parent windows.
  (Murray Cumming)
* Application: Use non-deprecated gtkmm/GTK+ accelerators API.
  (Murray Cumming)