Threads: Add a new doc line from the C docs.
Remove a comment about a fixed bug.
2.37.6
gmmproc: Add parameter return_value in _WRAP_VFUNC.

* tools/m4/vfunc.m4:
* tools/pm/Output.pm:
* tools/pm/WrapParser.pm: Add parameter return_value in _WRAP_VFUNC.
Bug #705699.
Link to a bug from a TODO comment
gmmproc: Pass 0 (NULL) instead of  to C functions.

* tools/m4/convert_glib.m4: Avoid passing "" to C functions
  because some C developers insist on treating "" and NULL
  differently even when there is no meaningful distinction
  and when that means obviously unwanted behaviour in response
  to the "".
  Bug #686909
  And this should help with bug #702456 .
Pass 0 (NULL) instead of  for C properties.

* glib/glibmm/objectbase.cc: set_property_value():
* glib/glibmm/propertyproxy_base.cc: set_property():
  If the value is a G_TYPE_STRING (a gchar*), and is "",
  then pass 0 instead.
  Bug #686909
Fix the build
Gio: Menu: Add insert/append/prepend_section() with no label parameter.

* gio/src/menu.hg: Because the label may be NULL in C,
  meaning that the sections will just be separated by spaces
  instead of having titles in the menu.
  Bug #702456 .
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 and linking to
  gthread-2.0.lib, as the gthread library is considered deprecated and it
  is no longer necessary to link to it since quite some time ago.
* Clean up the formatting of the Project Files.
* Fix the include paths on including the libsigc++ headers, notably
  sigc++config.h.
* Update the glibmm and giomm projects as newer sources were added so that
  these libraries will build properly.
Merge branch 'master' of git://git.gnome.org/glibmm
JOHNE - Bump version number to 2.37.6