Add input ports to composite stages
By now, the input ports of a composite stage are delegated directly to the first stage. For the framework to work properly, we need input ports which are directly related to the composite stage. see #110 (closed)
By now, the input ports of a composite stage are delegated directly to the first stage. For the framework to work properly, we need input ports which are directly related to the composite stage. see #110 (closed)