Fix presync precision

The presync may fail if the initial guess is too coarse. Set
SyncQuality.ACCURATE only if the uncertainty on fAlpha is low (arbitrarily set
to 0.01).

Signed-off-by: Francis Giraldeau <francis.giraldeau@gmail.com>
Update cli command

Signed-off-by: Francis Giraldeau <francis.giraldeau@gmail.com>