More balanced order distribution

When using distributed orders, the JobScheduler can be configured to distribute the orders more equally among the cluster members.

The new behaviour is configured in the JobScheduler configuration file with

<params>
    <param name="scheduler.order.distributed.balanced" value="true"/>
</params>

or at the command line with

scheduler.order.distributed.balanced=true

The cluster members coordinate the order distribution with UDP messages. Please consider this in your firewall settings. Otherwise the order exectution can slow down several seconds per step.