NANOG List Update - Moving Forward

I'll offer an evenhanded comment in that it's frustrating that the
headers used have changed, since some of us key procmail off of them
to split mailing lists into folders, but it *is* nice to see that the
current NANOG mailing list team has been supporting List-Id for some
time now, and that such was propagated properly between old and new
host. Good job.

Unfortunately my filter predates NANOG's use of that so now I gotta
go fix it here.

... JG