Fix warnings detected by clang.

include/dynamic-graph/contiifstream.h

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

include/dynamic-graph/signal.t.cpp

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

src/debug/contiifstream.cpp

src/plugins/shell-procedure.cpp

src/shell/functions.cpp

src/traces/tracer-real-time.cpp

src/traces/tracer.cpp

tests/signal-cast-registerer.cpp