print-dhcp6.c: update of the references RFC with their titles
Merge pull request #46 from fxlb/master

print-dhcp6.c: update of the references RFC with their titles
LBL moved the old NRG stuff to an "old" directory.  Update the URL.
Merge branch 'master' of git+ssh://bpf.tcpdump.org/tcpdump/master/git/tcpdump
If we don't have IPv6 address support, don't try to print IPv6 addresses.
Fix display of MLDv2 queries
Add some MLDv2 test packets

The added packets are: a join, a regular query and reply, and a leave.
Merge pull request #47 from Tilka/master

Nit-picky whitespace fix