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gnocl::window -new options and commands

After a relatively quiet few days on the Gnocl front I added the following options and commands to the gnocl:window object.

-new commands
        hasFocus        return the name of the widget within the window that has 
                        the active keyboard input focus
        setFocus        set the focus to a named widget within the window
        present         bring a window to to the toplevel, deiconifying etc as 
                        necessary

-new option
        -defaultWidget  define which widget by default receives input focus


In addition to this, I've done some work to the gnocl::window online docs. This page has been in need of major updating for some time. So much new functionality has been added. There is still much to do, however. Most options are still 'TO BE COMPLETED' entries.

Finally, put the bare bits together to implement a Gnocl binding to the threads module.

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