V0.0.021 of library as by first suggestions of I-Campbell;
* Functions FindChanges and listComposer moved to SparkPlugB as methods.
* FOR index := LOWER_BOUND ... TO UPPER_BOUND.. DO
* CheckBounds() added for checking array sizes => TODO check array sizes(!)
* Added method SparkPlugB.PublishNodeData()
aliazzz 2020-09-03