Scale: Constructor: Remove the default parameter value.

* gtk/src/scale.hg: Because we already have a default constructor,
  and this made it ambiguous.
  Bug #707810 (cheshirekow)
Remove a now-irrelevant comment.
Wrap GtkSearchBar
Update Visual Studio Projects

* Purge some of the unecessary entries form the project files, notably the
  empty items in the Visual Studio 2005/2008 projects.
* Clean up the formatting of the Project Files.
* Fix the include paths on including the libsigc++, glibmm, pangomm and
  atkmm headers, notably the *config.h's of these dependencies.
* Update the gtkmm and gtk-demo projects as newer sources were added so
  that these will build properly, up to and including the newly-wrapped
  searchbar sources.
Button: Replace the icon_name ctor by set_image_from_icon_name().

* gtk/src/button.[h|cc]: Remove the constructor that takes an icon_name.
Add set_image_from_icon_name(). Bug #707791.
Regenerate .defs and .xml files
Window: Add set_opaque_region().
3.9.14
Widget: Make insert_action_group() public.

* gtk/src/widget.hg: Because it is convenient for me in Glom,
  where I need to call it in a helper function rather in the widget
  class itself, to avoid duplication.
Merge branch 'master' of git://git.gnome.org/gtkmm