New features in the development tree

As of revision [1656]

• Added MLD statistics [1587]
• Added PIM statistics [1591]
• Enable the loopback interface by default [1603]
• Enhanced PIM Register handling [1617]
• Renamed 'attach-log' method to 'monitor' [1629]
• Improved logging performance
• Support PIM hello option "old address list" used by old IOS implementations [1635]
• Fix the sending of icmpv6 Too Big messages [1644]
• Fix sending local PIM interface messages (reported by Jong-Hyouk Lee) [1645]
• Fixed compilation issues with g++ 4.1 (reported by Bernhard Schmidt) [1655]