renamed Signal to ISignal

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

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

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

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

...nt/methodcallWithPorts/framework/core/pipe/DummyPipe.java

...ariant/methodcallWithPorts/framework/core/pipe/IPipe.java

...hodcallWithPorts/framework/core/pipe/InterThreadPipe.java

...hodcallWithPorts/framework/core/pipe/IntraThreadPipe.java

...nt/methodcallWithPorts/framework/core/signal/ISignal.java

...odcallWithPorts/framework/core/signal/StartingSignal.java

...allWithPorts/framework/core/signal/TerminatingSignal.java

...callWithPorts/framework/core/signal/ValidatingSignal.java

...ariant/methodcallWithPorts/stage/basic/merger/Merger.java

submodules/JCTools