inconsistency problem when copying resource contents

[sunye]

When the contents of a normal resource are copied to a persistent one, using the following code:

targetResource.getContents().addAll(sourceResource.getContents());

The contents remain in both contents, causing inconsistency. It seems that the handshake is not treated correctly.

[gdaniel]

Need to check the behavior of XMI resources
xmiResource.getContents().addAll(sourceXMIResource.getContents());

The links should be removed, but we need to be sure about that.

[gdaniel]

Should be put in the tutorial / wiki (see #66)

[yvrng]

A call to EcoreUtil#copyAll is no longer necessary