GNOME Photos 3.9.5 Implements Thumbnailing for Flickr

GNOME Photos 3.9.5 is a very small bugfix release that replaces GdHeaderBar with GtkHeaderBar, as well as GdStack with GtkStack. It simplifies the PhotosDlnaRenderer (dlna-renderer) initialization, and removes the second close button displayed in the built-in notifications. Moreover, GNOME Photos was released two days later, implementing thumbnailing for Flickr and adapting the program to the GTK+ 3.9.10 API changes.