Update to 2.7.0

SIGNIFICANT USER-VISIBLE CHANGES

    o   The default graphics device in non-interactive use is now
        pdf() rather than postscript().  [PDF viewers are now
        more widely available than PostScript viewers.]

        The default width and height for pdf() and bitmap() have been
        changed to 7 (inches) to match the screen devices.

    o   Most users of the X11() device will see a new device that has
        different fonts, anti-aliasing of lines and fonts and
        supports semi-transparent colours.

    o   Considerable efforts have been made to make the default output
        from graphics devices as similar as possible (and in
        particular close to that from postscript/pdf).  Many devices
        were misinterpreting 'pointsize' in some way, for example as
        being in device units (pixels) rather than in points.

    o   Packages which include graphics devices need to be re-installed
        for this version of R, with recently updated versions.

+ New features and bug fixes.

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