What is timepps.h used for?

[Hal Murray]

ghane0 at gmail.com said:
> (If this is documented so clearly somewhere, please point me there.  Else I
> will summarise and add to the gpsd and ntpsec docs later). 

There is a chunk about timepps in INSTALL.

I don't think there is any overview about PPS processing.  There should be.  
I was going to wait until I had numbers.  (which may take a while)


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