Update gtkmm to 2.16.0.

2.16.0 (stable):

Gtk:
* Builder:
  - get_widget_derived(): Reference-counting correction.
  - create_from_file(), add_from_file(), create_from_string(),
    add_from_string(): Add method overloads that take a char* for the object
    ID, to avoid ambiguity with the two other overloads that take ustring or
    StringArrayHandle.
* Entry:
  - *_icon_* methods(): Rearrange parameters to make these consistent and
  so we can have more default parameter values.
  - Added icon_press and icon_release signals.
* FileChooserButton: Added the file_set signal, noticed by Damon Register.
* Stock: Added CAPS_LOCK_WARNING.
* Style: Added get_style_property_value() and templated get_style_property().
* Added Orientable and Activatable interfaces, though they cannot be used yet
  because that would break ABI of existing classes.
  (Murray Cumming)

Gdk:
* PixbufAnimation: create_from_file(): Throw an exception when the GError is
  not null. (Murray Cumming)

Maemo-specific API:
* TextBuffer: get/set_rich_text_format(), set_rich_text_format_all(),
  get/set_can_paste_rich_text(): Remove these Maemo-specific methods which have
  been superseded by the generic TextBuffer serialization functions.
  (Daniel Elstner, Openismus)
* Enums
  - Added Maemo-specific Gtk::HildonSizeType, wrapping HildonSizeType,
  which was inexplicably added to GTK+ in Maemo 5.
  - Likewise added Gtk::Hildon::InputMode, wrapping HildonGtkInputMode.
  (Daniel Elstner, Openismus)

2.15.5 (unstable):
(2.15.4 was skipped)

* Activatable: reset_vfunc() renamed to sync_action_properties_vfunc().
  (Murray Cumming)
* Builder:
  - create_from_file(), add_from_file(), create_from_string(): Add method
  overloads that take char* to avoid ambiguity.
  - get_widget_derived(): Correct reference-counting.
  (Murray Cumming)
* FileChooserButton: Add file_set signal.
  (Murray Cumming)
* Stock: Added CAPS_LOCK_WARNING.
* Added interfaces, but we can't use them yet without breaking ABI:
  Activatable, Orientation.

2.15.3 (unstable):
(2.15.2 was skipped)

Gtk:
* Action: Reimplemented set_tooltip() with the new C
  gtk_action_set_tooltip() function. Added get/set_label(),
  get/set_short_label(), get_tooltip(), get/set_stock_id(),
  get/set_gicon(), get/set_icon_name(), get/set_visible_horizontal(),
  get/set_visible_vertical(), get/set_is_important(), which are new
  accessors for the properties. Added the gicon property.
  Added block_activate() and unblock_activate().
* ImageMenuItem: Added get/set_always_show_image() and property.
* Scale: Added add_mark() and clear_marks().
* TreeView: Added a get_path_at_pos() overload that takes less parameters.
  (Murray Cumming)

Build:
* Allow pangomm to build outside the source tree.
  (Theppitak Karoonboonyanan) Bug #570325
* MSVC++: Disabled compiler warning 4250 also for MSVC2005.
  (Armin Burgmeier) Bug #568083 (Tao Wang).

* Documentation:
  Reference documetnation: Unescape some < and > characters.
  (Daniel Elstner, Murray Cumming) #568485 (Mihai Niculescu)

2.15.1 (unstable):

Gtk:
* CellView: Added get_model() and some new properties.
* Entry: Added unset_invisible_char(), get_invisible_char().
  Added the new progress and icon methods and the properties,
  including the new im-module property.
* ImageMenuItem: Added get/set_use_stock(), set_accel_group().
* MenuItem: Added get/set_label(), get/set_use_underline() and properties.
* PaperSize: Constructor: Remove the default value for the name parameter,
  because there is already a default constructor,
  This caused MSVC++ warning C4520 with Visual Studio 2008.
  (Tao Wang) Bug #568074.
* PrintOperation: Added draw_page_finish(),  set_defer_drawing().
* PrintSettings: Added get_resolution_x(), get_resolution_y(),
  set_resolution_xy(), get/set_printer_lpi().
* SelectionData:  Reimplement get_selection() using the new C getter method.
* StatusIcon: Added button_press_event, button_release_event and scroll_event
  signals. Added get/set_has_tooltip(), get/set_tooltip_text(),
  get/set_tooltip_markup().
* Stock: ORIENTATION_PORTRAIT, ORIENTATION_LANDSCAPE,
  ORIENTATION_REVERSE_LANDSCAPE, and ORIENTATION_REVERSE_PORTRAIT,
  avoiding undefined reference errors when trying to use these.
  (Murray Cumming) Bug #568416 (Tao Wang).
* TextBuffer: Added the paste_done signal.
* TextView: Added im-module property.
* TreeModel::Path::empty(): Also check for a null underlying
  GtkTreePath. Added operator bool() to do the same, just calling !empty().
  (Murray Cumming)

Gdk:
* Drawable::draw_pixbuf(): Add an override without a GC parameter, becauase it
  can be NULL in C.
* Screen: Added get_monitor_width_mm(), get_monitor_height_mm(),
  get_monitor_plug_name().

* Windows build:
  - Disabled MSVC++ compiler warning 4250
  (Armin Burgmeier) Bug #568083 (Tao Wang).
  - Installer: Added Simplified Chinese translation. (Tao Wang)

2.15.0 (unstable):

* CellRendererPixbuf: Added the icon-name and follow-state
  properties, noticed by Mathias Hasselmann.
  (Murray Cumming)
* Printer::enumerate_printers(): Fix a refcounting problem found by Tor Krill.
  (Armin Burgmeier)
* Gdk::Window: Added an invalidate() that takes no rect
  parameter because it can be NULL in C.
  (Murray Cumming)
* Cleaned up gtk includes to use only toplevel headers, as may be required by
  a future GTK+ version.
  (Przemysław Grzegorczyk) Bug #564006
* Container: Use GType instead of GtkType for the  child_type_vfunc() return type
  This should allow soure code to use gtkmm if it declares GTK_DISABLE_DEPRECATED.
  (Murray Cumming) Bug #562893 (Dénes Faluvégi)
* Documentation:
  TreeModel: set_value_impl() documentation: Mention row_changed(),
  not set_row_changed(). Bug #562505 (Bohumir Zamecnik)
* HandleBox: Restore the child-attached property, which was lost at some point
  during 2.14.
* LinkButton: Resore the visited property definition, which was lost at some
  point during 2.14.
  (Murray Cumming)
* CellView, ComboBox, EntryCompletion, IconView: Added unset_model().
  (Alexander Shaduri) Bug #555268


(jmcneill)