Tracing part

At this part, depending on what debug options were chosen, for every step of execution, information about the transition is printed. The debug options available and the corresponding classes of information are:

a	the state transition, current event and messages sent
d	the random samples chosen for processes steps and message transmission delays
e	event status
t	timer status
p	protocol-defined tracing information; this information can be printed by invocation
	of the procedure debug(``p", ``message ", args) by the protocol.
s	if multiple executions of a protocol are run in one simulation invocation, this debug
	option chooses to also get the information on the mean numbers together with the
	size of the topology are added in files times.protocol_number and mess.protocol_number
	(subdirectory /stats)
g	if the visual output display interface is disabled, this option directs the
	debug-file-information to the screen (standard output).