feat: Add basename support

Now, the user can decide to show only the program name, instead of the
full program path. It is useful, when you have a very long hierarchy of
directories, which, with the full path name, the user might not see the
program name.

doc/nethogs.8

@@ -19,6 +19,7 @@ nethogs \- Net top tool grouping bandwidth per process
 .RB [ "\-l" ]
 .RB [ "\-f filter" ]
 .RB [ "\-C" ]
+.RB [ "\-b" ]
 .RB [ "\-g period" ]
 .RI [device(s)]
 .SH DESCRIPTION
@@ -62,6 +63,9 @@ monitor all devices, even loopback/stopped ones.
 \fB-C\fP
 capture TCP and UDP.
 .TP
+\fB-b\fP
+Display the program basename.
+.TP
 \fB-g\fP
 garbage collection period in number of refresh. default is 50.
 .TP
@@ -86,6 +90,9 @@ sort by RECEIVED traffic
 l
 display command line
 .TP
+b
+display the program basename
+.TP
 m
 switch between total (KB, B, MB) and throughput (KB/s, MB/s, GB/s) mode
 .RE