Clear DOPs only when we get a skyview report.

This solves the disappearing epx/epy bug on SiRFs, but it was actually a
systemic problem that affected several drivers.  Navigation solution messages
were clearing DOPs, making it impossible for the error modeller to compute
estimates. New logic: Clear DOPs only when we get a skyview report.  They'll
be regenerated by our visibility-matrix calculation when the skyview sentence
is analyzed.

If a sentence from the device supplies a DOP between the time the visibility
calculation is done and when the next fix is reported, it will override
our computed value.  This might change later!

This change required a regression-test rebuild.

1 files changed, 35 insertions, 35 deletions

diff --git a/test/daemon/garmin-geko201.log.chk b/test/daemon/garmin-geko201.log.chk
index b5f3e645..d5f6ae4c 100644
--- a/test/daemon/garmin-geko201.log.chk
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 $GPGSV,3,2,09,06,39,195,46,09,40,115,46,14,48,286,47,25,09,307,36*71
 $GPGSV,3,3,09,30,67,295,50*49
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 $GPBOD,,T,,M,,*