New Features:
* Hide titlebar when maximized
* Require Gtkmm 3.6
* Use Gtk::SearchEntry for search entries
* Return spell check support (requires GtkSpell3)
* Redesing main window toolbar
* Ability for add-ins to add actions to main window search and note modes
Fixes:
* Remove use of deprecated gdk_threads_* functions
* Fix ocasional crashes and hungs when launching syncronization
* Save main window pos and size on quit
* Fix opening notes via command line args
* Gnote silently discard/truncate data when disk is full (#627317)
* Fix export to HTML with XML special chars in title (#694935)
