File Input/Output

[GoogleCodeExporter]

A common suggestion from several people is that the library should provide the 
posibility to write packets using the functions `Print`, `HexDump`, etc. to 
output files (using `ofstreams`).

Another common suggestion is that the library should be able to read and write 
files in pcap format.

Taking note for next release...

Original issue reported on code.google.com by pellegre...@gmail.com on 2 Apr 2012 at 9:33