Documentation, support

[Hal Murray]

from https://gitlab.com/NTPsec/ntpsec/-/merge_requests/1468

> The packets were being ignored.  Now, they are treated in accordance with
> https://docs.ntpsec.org/latest/standards.html which says, "Mode 1
> (Symmetric Active) is no longer implemented; such packets are treated as
> ordinary client (mode 3) packets." 

That comment brings up 2 interesting issues.

First, some of our documentation is over in our web pages where nobody 
looks.

Second, we need to keep track of how much old junk we support and a way to 
decide what/if we support some old junk.

Any ideas on either?


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