Support for copy/paste of entities/attributes/relationships
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                 Key: CAY-1080
                 URL: https://issues.apache.org/cayenne/browse/CAY-1080
             Project: Cayenne
          Issue Type: New Feature
          Components: CayenneModeler GUI
    Affects Versions: 3.0
            Reporter: Andrey Razumovsky
            Assignee: Andrus Adamchik


Support for copy/paste of entities/attributes/relationships.
This is GSoC 2008 task.

Some of my ideas follow. 
We can implement copy-paste in two ways.

First: the buffer is valid only within a sole project. So when you open another 
project, copied data is lost.
Second, the buffer is stored in whole modeler application, or even system 
buffer. This allows to copy data between different projects, but is more 
complex because we need to create shallow copies of entities, attrs etc. 
Personally I use only one cayenne.xml currently.

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