Allow all node calls in contracts #1108
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Before this change, Kind 2 rejected calls to nodes that were subject to refinement (i.e., with a contract that contains at least one guarantee) within a contract. This behavior was inconsistent with the fact that the same class of calls was allowed in property checks. Notice that this means the assumptions, which are considered to hold, and the guarantees, which need to be checked, may be refined during the analysis for the newly permitted class of node calls. We may introduce annotations in the future to control this new behavior.