Hierarchical composition

[lgeretti]

Originally reported by Luca Geretti (Bitbucket: lgeretti, GitHub: lgeretti)

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Allow the creation of components that represent a collection of I/O automata and other components, where we specify which I/O elements represent the interface of the enclosing component.

Depends on Issue 42

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• Bitbucket: https://bitbucket.org/ariadne-cps/release-1.0/issue/43