Update darkstat to 3.0.711 by mainteiner update request via PR 39401.

Changes since 3.0.708:
- Split --debug into --verbose and --no-daemon
- Include launchd config and instructions for running darkstat
  on Mac OS X.  Contributed by Damien Clauzel.
- Implement PPPoE decoding on ethernet iface. (--pppoe)
- Web: Add automatic reload button.  Thanks Dennis!
- Web: Add a graph legend with min/avg/max.
- Web: Remove hashtable stats pages.

(obache)