pmciscoios: skeleton & first rough implementation approach (yet incomplete)
support fractional seconds in RFC3164 timestamp

regression potential is minimal and this happens frequently
enough in practice to become part of the heuristic
pmciscoios: first functional version
support prepended year in RFC3164 timestamp

again, regression potential is extremely slim. this is done e.g.
by Brocade devices. Note that the timestamp must contain only
ONE year (either in front or after month/day). If two are present,
it is flagged invalid (what it obviously really is).
pmciscoiso: support Nexus TZ string in date (but right now ignore it)

This does not longer give a parsing error, however, no information is right
now obtained from that TZ string.
pmciscoios: hardcode some time zone offsets
Merge branch 'v8-stable-newparsers'
Merge remote-tracking branch 'github/master'