Pretty print system memory information.
Add output information when a kill signal is received.
Fix use of some uninitialized values.
Add report about system cache page in/out from/to disk. Thanks to Jean-Guillaume de Rorthrais for the feature request.
Add reports about network interfaces utilization and errors. Option -p | --dev-only have change to -D | --device-only and add new option -N | --network-only to limit report on some network interfaces. Thanks to Julien Rouhaud for the feature request.