[44net] New mailing list '44NGN' - was '44 net connectivity'

As a few people have requested, I've created a new mailing list for discussions of the architecture of the Next Generation Network for AMPRNet, such as have been recently discussed here under the subject line of '44 net connectivity'. Feel free to join, and to invite your colleagues to join at <https://mailman.ampr.org/mailman/listinfo/44ngn> Welcome! - Brian