websphere: broker programming

1. compute node:
Compute Mode: - LocalEnvironemnt => pass whole message but not the LocalEnvironment
- Message => pass whole LocalEnvironmentbut not the Message
input: InputRoot, InputLocalEnvironment;
output: OutputRoot, OutputLocalEnvironment;


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- Collector, Trace node only has ${Root}, not ${InputRoot}
- OutputRoot.MQMD should be set before OutputRoot.XMLNSC & OutputRoot.BLOB
- InputLocalEnvironment.WrittenDestination.MQ.DestinationData.msgId contain the msgId from MQOutput node