sync with the latest core version in mapmin
Correct the type error - icmp6_hdr instead of icmp_hdr
Set the 1460 MTU on the tunnel interface
Sync with mapmin a9d8f5d55d37f1af6c714cb959203566032e6a3f.
Make the code compile.
Add translation of fragments in v4->v6 direction
Supply empty string for a parameter if passed NULL, to avoid crashing
Sync nat46-core.* with 758a02e6f9e4c43553e0fc37d83c286c77febe94 from nat46 repository
Fix the glue code to align with latest NAT46 core