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).

options.h

@@ -34,6 +34,12 @@ typedef enum {
   OPTION_LINEDISPLAY_ONE_LINE_SENT
 } option_linedisplay_t;
 
+typedef enum {
+  OPTION_BW_BITS,
+  OPTION_BW_BYTES,
+  OPTION_BW_PKTS,
+} option_bw_unit_t;
+
 /* 
  * This structure has to be defined in the same order as the config 
  * directives in cfgfile.c.  Clearly this is EBW.
@@ -59,7 +65,7 @@ typedef struct {
     int timed_output;
     int no_curses;
     int num_lines;
-    int bandwidth_in_bytes;
+    option_bw_unit_t bandwidth_unit;
     option_sort_t sort;
 
     int bar_interval;