#3 Chameleon: add "not saved" warning

[cafu2500]

The following happens too often to me:

Using Chameleon, I export an instance model from Rose.
After generating with Flux, everything is well and
I submit the Rose Model and struts-config to my SCM.

Unfortunately, the changes made in Rose are not saved
yet and the only indicator is Rose's dialog "Save
changes?" when I close Rose hours later ...

I would like to have a dialog "Model not saved.
Continue? Yes / No" when I call "Export instance model"
from
an unsaved model. The "No" button could also
be exchanged for a "Save & Continue" button ;-)

[cafu2500]

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