Naming convention for files:
''''''''''''''''''''''''''''

  pgm_<top>_<com>_<loss>_<swi>_<rwi>[_<filter>][_<NNACK>][_<RNACK>][_<HIB>].<lg>

where they are 
   * mandatory elements :
	<top> (topology)
	may be:
		SNR = linear one with sender-node-receiver
		SNNR = ...

	<com> (communications between proceses) 
	may be:
		1B = 1 place buffers
		1dB = 1 place buffer with delays
		...

	<loss> (policy of losses)
	may be:
		1fL = 1 fixed loss
		1L = 1 non-deterministic loss
		...

	<swi> (Sender window increment)
	may be:
		nd = non-deterministic
		t = timed
		...

	<rwi> (Receiver window increment)
	may be:
		nd = non-deterministic
		oSPM = when SPM only are received
		all = when all (ODATA, RDATA, SPM) are received
		...
   
    * optionnal element 

	<filter> (policy for filtering of NACKs in Nodes)
	may be:
		no = none (default)
		filter = filtering on
		...

	<NNACK> (policy for repeating NACKs in Nodes)
	may be:
		no = none (default)
		...

	<RNACK> (policy for repeating NACKs in Receivers)
	may be:
		no = none (default)
                1sRNAK = 1 state RNAK
		...

	<HIB> (heartbeat timer in Sender)
	may be:
		no = none (default)
		...

   * and the langage descrition

	<lg> (language of description)
	may be:
		if1 = IF 1.0
		if2 = IF 2.0
		pml = Promela (Spin)
                ...