Docker Studio - Robustize synchronize

[mdutoo]

• for now synchronize() explodes when a VBox VM is stopped while its status in the ecore model is still believed to be started. I'm working on a patch (by using docker props defaults, or merely checking status as in start()).
• synchronize() by name and not only by id ? That would quite be in the spirit of synchronize(), that is to help a diagram work again. It would allow to use a newer diagram (ex. with additional conf) to control an older Docker machine, or an older diagram control a newer Docker machine (ex. that has been created by a newer diagram that has been lost since that).