Add "omp cancel taskgroup" support to OmpCluster task graph

Guilherme Valarinirequested to merge
improv-67/add-task-cancel-support into master

This MR adds support for omp cancel taskgroup directive, commonly used in iterative applications. It also fixes problem with the current round-robin scheduler which was not functioning properly. For more information on this task, check the issue below.

Closes #67 (closed)

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