2.63.1: (unstable):
Distro packagers should probably not package this yet.

Glib:
* ustring: Fix memory leak in make_valid()
  Use convert_return_gchar_ptr_to_*() in a couple of methods
  (Martin Ejdestig) Merge request !11
* Add ustring::sprintf(), wrapping g_strdup_printf()
  (Daniel Boles) Issue #21
* Fix callback races in glibmm when GSource is destructed
  (Dainis Jonitis) Issue #41
* Checksum, Datetime, TimeZone: Declare as _CLASS_BOXEDTYPE
  (Kjell Ahlstedt)
* Property: Add const get_proxy() returning ReadOnly
  Getting Proxy from ReadOnly is const
  (Daniel Boles) Issue #44
* Property: Update for compatibility with Gtk::Builder
  (Kjell Ahlstedt)
* Fix memory leak in Variant<std::tuple<>>::create()
  (Van de Bugger, Kjell Ahlstedt) Issue #48
* Remove TimeVal
  (Kjell Ahlstedt)

Gio:
* Add Application::add_option_group()
  (Kjell Ahlstedt Issue #46 (Patrick Storz)
* DBus::Object: Fix refcounts in some vfuncs
  (Kjell Ahlstedt)
* Gio::DBus: Add ObjectProxy, ObjectSkeleton, ObjectManager,
  ObjectManagerClient, ObjectManagerServer
  (Kjell Ahlstedt) Issue #43 (Martin Ejdestig)
* Drive, MountOperation, ThemedIcon, TlsDatabase, VolumeMonitor:
  Fix ownership of some lists and arrays (Fixes memory leaks
  and dangling pointers)
  (Kjell Ahlstedt)
* Add SocketControlMessage::add_deserialize_func()
  (Kjell Ahlstedt) Issue #52 (Ankur deep jaiswal)

gmmproc:
* Update for new glib deprecation macros
  (Kjell Ahlstedt)

Build:
* Doxyfile.in: Remove unused configuration constants
  (Kjell Ahlstedt) Issue #22
* Require glib-2.0 >= 2.61.2
  (Kjell Ahlstedt)
* Change the ABI to glibmm-2.64
  (Kjell Ahlstedt)

Documentation:
* Glib::init(), Gio::init(): Improve the documentation
  (Kjell Ahlstedt) Issue #49 (Van de Bugger)
* Glib::ustring can't always replace std::string
  (Kjell Ahlstedt) Issue #47 (Patrick Storz)