rinetd 0.71

Warning: this release is broken, please use version 0.72 instead.

• IPv6 support
• fix a display overflow in data usage statistics
• made the configuration parser more tolerant with service names that contain
  dashes (e.g. snmp-trap) or hostnames with underscores (e.g. _http.example.com).
• create the log file if it does not exist
• new Visual Studio project file