InterfaceEntry: removed protocol[34]data fields; removed dependency on "TRILLInterfaceData.h" and "ISISInterfaceData.h"
IPv6InterfaceData: pulled changes from the inet repo

- renames: nbo->nb, hostMData->hostMcastData, routerMData->routerMcastData
- RouterMulticastData.multicastTTlThreshold deleted (not needed for IPv6)
- move methods in the source code (multicast related methods were in a regions
   that was excluded without xMIPv6)
join to the ALL_IGMPv3_ROUTERS_MCAST group from the IGMPv3 module
instead of RoutingTable
do not join to the ALL_MLDv2_ROUTERS_MCAST group (ff02::16) in all routers
IPv[46]Route: move 'routingProtocolSource' field back to ANSA code base

They won't be added to INET 2.2, because they seem too project specific.
INET route classes already contain a source field to identify the routing
protocol.
cosmetic changes