[Drawkit] Minor framework issues

[Brad Larson]

DKDrawing+Paper.h is not an included header with the framework, which  
can cause problems if you want to reference the default paper sizes.   
For example, [DKDrawing isoA2PaperSize:NO] is used in the default  
makeDefaultDrawing method in DKDrawingDocument, which you may want to  
override for your application's own new documents.

I know that you do not wish for the framework to be garbage-collected  
only, but I think it would be a good idea to change the build option  
for Objective-C Garbage Collection to Supported from its current  
Unsupported to allow garbage-collected applications to make use of it.

Also, the DrawDemo freezes when displaying the File | Save dialog or a  
sheet asking the user to save a document before quitting, yet my own  
DrawKit-based application works just fine in those cases.  I can't  
seem to find the problem, but it may be related to the XCode 3.1 beta  
5 that I'm running as a build environment on this machine.

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