support of feathered edge in GnomeRectCanvasItem

[Anil <anil gdit iiit net>]

Hi

I think it would be better to extend the functionality of
GnomeCanvasRectItem so that it supports feathered edges (round
corners). So something like radius can be included as one of the
attributes which indicates the radius of the arc at the corner. A radius
of zero indicates an edged rectangle.

Regards,
anil gdit iiit net
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