[Rock-dev] Multiple changes in rock-roby and roby, requiring one small change for supervision users

[Sylvain Joyeux]

Another thing I overlooked:

Since, in the bundles, data services and composition models will be all 
stored in the same folder, the loading order has changed.

It means that you might have some files in compositions/ that complain 
about missing data service models. You will need to add the right 
load_system_model stanzas in these files so that the services get defined.

Sorry
Sylvain