[Graphics] Additional features

[Michael Goffioul]

src/ChangeLog

2008-02-02  Michael Goffioul <michael.goffioul at gmail.com>

    * graphics.h.in (base_graphics_backend::get_screen_size,
    graphics_backend::get_screen_size): New methods.
    (graphics_backend::available_backends): Export symbol.
    (class figure::properties, class axes::properties): Export classes.
    (figure::properties::get_boundingbox): New utility method.
    (figure::properties::position): Use valid default position.
    (axes::properties::gridlinestyle, axes::properties::minorgridlinestyle):
    Use dotted line style as default.
    * graphics.cc (default_figure_position): New static function.
    (gnuplot_backend::get_screen_size): New method.
    (figure::properties::get_boundingbox): New utility method.
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