[gpsd-dev] PPS in 3.11

[Gary E. Miller]

Yo All!

Uh, oh.  I see Miroslav's patch broke some unstated assumptions.

His patch used the CALCULATED time of the last NMEA timestamp
(last_fixtime_real).  Not the RECEIVED time of the last NMEA
timestamp (last_fixtime_clock).

That introduces a race between PPS and NMEA time and breaks the 
assumption that the PPS time is on the edge of the next second.

I can also see how some misleading variable names and unneeded
copying and renameing of variables is confusing things.

For example 'drift' implies to me a delta or rate of some kind, like
the drift of a boat.  Instead it is an exact benchmark point in time.

I'm gonna have to noodle over it a bit, but it is clearly broken.

RGDS
GARY
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