now /use_sim_time:=true works as expected:
	-DefaultNode reads the val from the parameterTree and sets "useSimTime"
	-then the commandLine remapping of /use_sim_time is read the value of "useSimTime" potentially replaced
	-the commandLine remapping does not interfere with readings from the parameter tree
	-but the value from ParameterTree does not have to be the same as used by the node! (cmd.line remapped one)