[Graphics] Add utility functions

[Michael Goffioul]

src/ChangeLog

2008-01-30  Michael Goffioul <michael.goffioul at gmail.com>

    * graphics.h.in (axes::properties::transform,
    axes::properties::untransform): New utility methods.
    (axes::properties::get_transform_matrix,
    axes::properties::get_inverse_transform_matrix,
    axes::properties::get_opengl_matrix_1,
    axes::properties::get_opengl_matrix_2,
    axes::properties::get_transform_zlim): New accessors.
    * graphics.cc (axes::properties::transform,
    axes::properties::untransform): New utility methods.
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