add ethertype for IPv6 for etterfilter
adjust constant pattern and constant values so they get recognizes as a constant
header field definitions for IPv6 for etterfilter
correct offset to ethertype in Ethernet header definition
debug output
update TODO
Merge remote-tracking branch 'upstream/master' into update-todo

Conflicts:
	TODO
Merge pull request #353 from koeppea/update-todo

update TODO
Merge remote-tracking branch 'upstream/master'