Log Message:
Changes 2.12.7:
* UIManager: add_ui_from_string():
  Fix a problem with use of non-ASCII text in UI markup.
* TreeModel::Path (TreePath):
  TreePath(In pbegin, In pend) constructor:
  Initialize gobject_ to avoid a crash.

Changes 2.12.6:
* Container: Avoid a useless warning about remove() with custom containers.
* Build: Fixed a warning from g++ 4.3.
* Documentation: Correct the debian/Ubuntu package name.