#13 Enhance Protocol to enable for interactions like CNP

[Jiri Biba]

The current graph representation of Protocols does not allow for implementation of CNP protocol as it cannot be expressed that a certain number of messages of a specific type should arrive in any permuation of ordering. Moreover, timeouts should be involved in some manner.

[Jiri Biba]

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The number of messages to arrive in any permuation must not be expected to be known in design time.

[Nobody/Anonymous]

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There should be also accounted for more than 2 participants of the interaction (i.e. 1:1 negotiation) - at least 1:N interactions should be considered.