Minor changes in the Schedulers, added a StepScheduler
Renamed PeriodicScheduler to TimeScheduler
Added ExecutionMode to the DynamicPartitionerConfiguration
Improved the DynamicPartitionerConfiguration in the DefaultGraph
Made TimeScheduler.interval public
Modified the Schedulers; StepScheduler is currently not usable
TimeScheduler usable with synchronous execution
Added the TimeScheduler.timeUntilNextPartitioning method
TimeScheduler works with first case of pureAsynchronousExecution
TimeScheduler works with the second case in
DefaultGraph.pureAsynchronousExecution