2005-12-17 Murray Cumming <murrayc@murrayc.com>

        * cairomm/Makefile.am:
        * cairomm/refptr.h: Add shared
        reference-counting smartpointer, using
        the reference-count in the object. A copy
        of the tried and tested glibmm RefPtr.
        * cairomm/context.cc:
        * cairomm/context.h:
        * cairomm/fontface.cc:
        * cairomm/fontface.h:
        * cairomm/pattern.cc:
        * cairomm/pattern.h:
        * cairomm/surface.cc:
        * cairomm/surface.h: Make constructors protected
        and add public static create() methods that return
        instances in RefPtr<>s. This allows reference-counted
        objects to be clearly const or non-const, and allows
        casting between related types.

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