A longstanding bug in error modeling fixed.

The guard controllong DOP computation wasn't right.  The result was
that x/y error estimates were computed much less often than they
should have been.

1 files changed, 57 insertions, 85 deletions

diff --git a/test/daemon/bu303-climbing.log.chk b/test/daemon/bu303-climbing.log.chk
index cb88708c..fab5fa09 100644
--- a/test/daemon/bu303-climbing.log.chk
+++ b/test/daemon/bu303-climbing.log.chk
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