Add license header.

CMakeLists.txt

doc/additionalDoc/package.h

include/dynamic-graph/all-signals.h

include/dynamic-graph/contiifstream.h

include/dynamic-graph/debug.h

include/dynamic-graph/dynamic-graph-api.h

include/dynamic-graph/entity.h

include/dynamic-graph/exception-abstract.h

include/dynamic-graph/exception-factory.h

include/dynamic-graph/exception-signal.h

include/dynamic-graph/exception-traces.h

include/dynamic-graph/factory.h

include/dynamic-graph/functions.h

include/dynamic-graph/interpreter-helper.h

include/dynamic-graph/interpreter.h

include/dynamic-graph/plugin-loader.h

include/dynamic-graph/pool.h

include/dynamic-graph/shell-procedure.h

include/dynamic-graph/signal-array.h

include/dynamic-graph/signal-base.h