Option to display packet counts - Frédéric Perrin <fperrin@brocade.com>

Add a "-u unit" CLI option, as well as a "bandwidth-unit" configuration
file option. With "-u packets", traffic is accounted using packets per
second; the other options are "-u bits" and "-u bytes".

"-B" is still recognized as synonym to "-u bytes".

The default is "-u bits", keeping the current behaviour of iftop
(everything is in bits/s, except the cumulative totals).

cfgfile.c

@@ -30,7 +30,8 @@ char * config_directives[] = {
 	"promiscuous",
 	"hide-source",
 	"hide-destination",
-	"use-bytes", 
+	"use-bytes",
+	"bandwidth-unit",
 	"sort", 
 	"line-display", 
 	"show-totals",