[gtkmm] Updated installer for win32

[Cedric Gustin <cedric gustin swing be>]

A new version of the installer for gtkmm-2.2 on win32 is now available on 
my site

http://www.pcpm.ucl.ac.be/~gustin/win32_ports/

The corresponding gtkmm-2.2 individual file has also been updated 
accordingly. The gtk+ runtime installer available on 
http://www.dropline.net/gtk/ is now a requirement for the gtkmm installer 
(I'm just trying to push the adoption of an official installer for gtk+). 
If you prefer to use your own gtk+ distribution, you have to revert to the 
individual gtkmm and linsigc++ files (.tar.gz)

The installer now includes the official documentation (HTML) for gtkmm and 
the gtk-demo example. Thanks to a recent bug report by Pierre Mazoyer, I 
have also added some missing headers to the win32 distribution (among 
others clipboard.h, which is required by widget.h). Please note that even 
though those headers (plug.h, socket.h, clipboard.h, ...) are installed, 
some gtk+ objects might not be available on win32 (mostly because the 
corresponding gtk_*_get_type has not been DLL exported in the latest 
release of gtk-win32). See the latest README.win32 on CVS for a detailed 
list of the missing signals/methods (maybe I should included it in the 
installer by the way !).

I recommend to uninstall any previous distribution of gtkmm before 
installing the new one. In order to keep the installer version in sync with 
the current gtkmm release, I have not updated the installer version number 
(2.2.0).

As usual, feel free to report any problem/bug.

Cedric

P.S. : Murray, before releasing gtkmm-2.2.1, I must submit another (small) 
patch for win32, related to the headers installation problem I have 
described. I will put it tomorrow on bugzilla. I have also received an 
updated dispatcher.cc for win32 from Andrew Makeev. I guess it would be 
easier to discuss this dispatcher topic with interested people by opening a 
new bugzilla entry.