Xcos: "Region to superblock" fixed

Xcos: "Region to superblock" fixed

The action suffered from several regression since 6.0.0 and most of the 5.5.2
features were not useable anymore. As this feature is implemented in Java, it
pushes changes to the Model through the Controller without taking into account
Adapters' partial information. These information were then non conformant to the
underlying Model and introduced some flaw at I/O blocks allocation time (from
scicos_new / adapters calls), update (from Controller/Model calls), link
reconnection (from Controller/Model calls) and simulation (from adapters calls).

Change-Id: Ib568e1365dfe9d48a6e8fa9fc7e20fdabe6e518d