fc2td: convert SCNM trace files to tcpdump format

SCNM packet trace files are slighly different than tcpdump files (SCNM traces are more compact).

Use fc2td to convert a SCNM data file to tcpdump file.

Then you can use tcptrace to look at the tcpdump data file. The "-r" option will convert tcpdump file back to SCNM formatted data.

     % fc2td < ???.dat > scnm-tcpdump.dat