Log Message:
Update atk to 2.16.0

Changes in version 2.16.0:
==========================
*
* Bug 746459: Fix a couple of GTK-Doc comment blocks
* Visual Studio support
   * Speed Up Release Builds
   * Fix and improve .pdb Generation.
   * "Install" .pdb Files

Contributors:
Chun-wei Fan

Translations:
Josef Andersson (sv), Jiri Gronroos (fi), Baurzhan Muftakhidinov (kk),
Samir Ribic (bs), Zahari Yurukov (bg)

Changes in version 2.15.91:
===========================
*
* Building:
   * Bug 744413: Stop using deprecated GNOME-specific autoconf macros
     on configure.ac
   * Stop using deprecated gnome-autogen.sh on autogen.sh

Contributors:
Javier Jardon

Translations:
Muhammet Kara (tr), Dusan Kazik (sk)

Changes in version 2.15.4:
==========================
*
* AtkRole:
   * Bug 742806: Add new roles for fractions, roots, subscripts, and
     superscripts

Contributors:
Joanmarie Diggs

Changes in version 2.15.3:
==========================
*
* AtkState:
   * Bug 665598: Add ATK_STATE_READ_ONLY
* Bugfixing:
   * Unref STATE_TYPE class ref after using it at state_type_get_name
   * AtkTable: Added missing ":" on one gi annotation

Contributors:
Joanmarie Diggs, Alejandro Pineiro Iglesias

Translations:
Muhammet Kara (tr)

Changes in version 2.15.2:
==========================
*
* AtkRole:
   * Bug 739981: Add ATK_ROLE_STATIC and clarify ATK_ROLE_TEXT
* AtkState:
   * Bug 740152: Document the deprecation of ATK_STATE_ARMED
* Documentation:
   * Bug 740044: Fix some unclear language regarding ATK_STATE_ACTIVE
   * Bug 740066: Improve documentation related to AtkState and
     AtkStateSet
   * Extend atk_focus_tracker_notify deprecation documentation
   * Remove some in-code documentation, that is already part of the
     docs

Contributors:
Joanmarie Diggs, Alejandro Pineiro

Translations:
Anders Jonsson (sv)

Changes in version 2.15.1:
==========================
*
* Bug 407539: Add ATK_STATE_HAS_TOOLTIP
* Documentation:
   * Updated README file
   * Bug 737602: Update documentation to reflect an additional use
     case for STATE_INDETERMINATE