Merge branch 'coverage' into 'devel'

include/dynamic-graph/signal-caster.h

include/dynamic-graph/signal-helper.h

include/dynamic-graph/signal-ptr.h

include/dynamic-graph/signal-ptr.t.cpp

include/dynamic-graph/signal-time-dependent.h

include/dynamic-graph/signal.h

include/dynamic-graph/signal.t.cpp

include/dynamic-graph/time-dependency.h

include/dynamic-graph/time-dependency.t.cpp

include/dynamic-graph/tracer-real-time.h

include/dynamic-graph/tracer.h

include/dynamic-graph/value.h

src/command/command.cpp

src/command/value.cpp

src/debug/debug.cpp

src/debug/logger.cpp

src/debug/real-time-logger.cpp

src/dgraph/entity.cpp

src/dgraph/factory.cpp

src/dgraph/pool.cpp