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Provide sensible arrival time prior for early warning events

Leo P. Singer requested to merge leo-singer/ligo.skymap:early-warning-time-prior into master

Ensure that BAYESTAR's arrival time prior is long enough to contain at least half a cycle of the template autocorrelation sequence. Previously, the duration of the arrival time prior was calculated solely from the light travel times between the participating detectors. This fixes an issue where SNR time series for early-warning events could have been cropped to only 1-3 samples.

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