add the "visible" radio_property to all objects.

[Shai Ayal]

I attach a patch to add the visible property to all objects. The
property is of type radio_property with the allowed values of
"{on}|off"

Shai


2007-12-15  Shai Ayal  <shaiay at users.sourceforge.net>

        * graphics.h.in (all object classes) Add the visible property.
        * graphics.cc (all object classes) Ditto.
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