Hi Warner,

I was trying to check Ian's specific concern, that a valid source
of leap seconds might be ignored if a expired leapseconds file was
present. It seems that this is not the case, at lease based on my
reading of the code and comments. I included the references to the
code, so others could check if they wanted.

I actually suggested configuring the leapseconds file by default
to try and improve the vagueries of accepting advertised leap seconds
that you mentioned.

> NTP only recognizes June and December as valid leap insertion
> points.

Interestingly, this code seems to be gone from ntp_loopfilter.c and
based on a quick look through the rest of the code, I can't see a
similar general check. Some of the refclocks do retain this condition,
but the general code path doesn't seem to. Possibly we should take
this up with the NTP guys as a check worth retaining?

        David.
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