Fixes and updates

[Olivier Fourdan]

Quoting Jasper Huijsmans <jasper at moongroup.com>:

> I added a dialog to the settings manager. It is probably more a proof
> of concept than a finished product. You can popup the dialog by running
> 
> $ xfce-settings-show all
> 
> The dialog shows a list with available modules (only two at the
> moment).

Excellent, really. 

I've made a few additions lately too, channels can be saved/loaded directly to
an xml file now.

> For future plugin writers: the plugin dialog should be non-modal, that
> is don't use gtk_dialog_run(). I did and it makes the settings manager
> dialog insensitive while the plugin dialog runs. 

Hehehe, yes, indeed :)

Cheers,
--
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