Introduced HeadStage

...ant/methodcallWithPorts/framework/core/AbstractStage.java

.../variant/methodcallWithPorts/framework/core/Analysis.java

...ant/methodcallWithPorts/framework/core/Configuration.java

...ant/methodcallWithPorts/framework/core/ConsumerStage.java

...iant/methodcallWithPorts/framework/core/HeadPipeline.java

...variant/methodcallWithPorts/framework/core/HeadStage.java

...ariant/methodcallWithPorts/framework/core/OutputPort.java

.../variant/methodcallWithPorts/framework/core/Pipeline.java

...ant/methodcallWithPorts/framework/core/ProducerStage.java

...ant/methodcallWithPorts/framework/core/RunnableStage.java

...ant/methodcallWithPorts/framework/core/StageWithPort.java

...methodcallWithPorts/framework/core/pipe/AbstractPipe.java

...thPorts/framework/core/pipe/OrderedGrowableArrayPipe.java

...allWithPorts/framework/core/pipe/OrderedGrowablePipe.java

...variant/methodcallWithPorts/framework/core/pipe/Pipe.java

...dcallWithPorts/framework/core/pipe/SingleElementPipe.java

...ant/methodcallWithPorts/framework/core/pipe/SpScPipe.java

...lWithPorts/framework/core/pipe/UnorderedGrowablePipe.java

...java/teetime/variant/methodcallWithPorts/stage/Clock.java

...ime/variant/methodcallWithPorts/stage/ObjectProducer.java