SD_task_get_parents(task) and SD_task_get_children(task)
* Add getters on amount of workstations and list:
SD_task_get_workstation_count(t) and SD_task_get_workstation_list(t)
+ * Add getter on task kind: SD_task_get_kind(task)
+ * Update the start_time and finish_time of tasks on completion/failure
+ * Bugfix: Remove task from state swags when destroyed
Bug fixes: