[Drawkit] DKDrawing metadata

[Brad Larson]

I noticed that the DKDrawingObject had some nice metadata helper  
methods, but DKDrawing did not, so I created a category to clone those  
same methods for DKDrawing.  The files for that category are attached.

If there are differences in the implementation between DKDrawing and  
DKDrawableObject that might cause problems with this port, please let  
me know and I'll correct them.

______________________
Brad Larson
SonoPlot, Inc.
3030 Laura Lane, Suite 120
Middleton, WI 53562


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