* include/dynamic-graph/signal-base.h,
	  * include/dynamic-graph/signal-ptr.h,
	  * include/dynamic-graph/signal-ptr.t.cpp,
	  * include/dynamic-graph/time-dependency.h,
	  * include/dynamic-graph/time-dependency.t.cpp,
	  * src/dgraph/entity.cpp, dependancy -> dependency,
	  * unitTesting/test_depend.cpp: makes the test_depend.cpp test works.

* New class SignalCaster
* Re-added the get, set and trace commands to signals

Renamed dynamic-graph-API.h to dynamic-graph-api.h in every header file.

(dynamicGraph/ -> dynamic-graph/)

Configured dynamicGraph package and cmake files. Last-minute adjustment to code for SOT separation (SOT Break)