[Graphics] More convenient backend access

[Michael Goffioul]

The attached patch allows a more convenient backend access from any
graphics_object (by delegating to the parent object). It's not heavily
used for the moment, but I'm sure it'll be convenient for future development.

Michael.

src/ChangeLog

2008-01-23  Michael Goffioul <michael.goffioul at gmail.com>

    * graphics.h.in (base_properties::get_backend,
    base_graphics_object::get_backend, graphics_backend::get_backend):
    New methods for convenient access to the backend.
    (figure::get_backend, figure::set_backend): Remove.
    * graphics.cc (base_properties::get_backend): New method.
    (Fdrawnow): Use graphics_object::get_backend to simplify code.
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