Added Gtk+ testing utilities.
* gtk/gtktestutils.h, gtk/gtktestutils.c: added unit test utility functions. for the most part, the functions herein involve navigating and interacting with dialog elements programatically, to automate user interaction tests of dialogs and widgets. * gtk/gtk.h: include gtk/gtktestutils.h as public API. * gtk/gtk.symbols: added gtk_test_* symbols. * gtk/Makefile.am: include gtktestutils.h and gtktestutils.c into the build. generate gtktypefuncs.c which contains a list of all _get_type functions in Gtk+ and Gdk. svn path=/trunk/; revision=19010
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