[wxsig] Other website updates

[William Beals]

Folks:

As you have no doubt noticed, I am catching up on a lot of T238 issues.  Of
note:

1) Links to external websites have been updated or omitted depending on
availability.
2) I had the URL for AAG wrong (for a long time), it is now correct.
3) By request, I have added a page on how to use the DS1994L real-time
clock.

will

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Will Beals