commit (HEAD): graphics factory

From: Tomas Frydrych (tomasfrydrych_at_yahoo.co.uk)
Date: Sun Mar 07 2004 - 15:51:03 EST

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    I made some changes to the graphics factory to make the whole system
    more robust.

    the only changes to platform code are in xap_FEApp constructor, which
    I have made -- there should not be any breakage, but if there is my
    appologies.

    I have also added UT_VersionInfo class to ut_misc.h; really just a
    wrapper around four ints with some convenience functions; it is used
    with new virtual GR_Graphics::getVersion() but it could be useful for
    plugins in general (the graphics versioning is necessary for graphics
    implemented as loadable plugins).

    Tomas

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