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Use CCDB to determine whether the clock is good, and, if so, use it instead of RCDB's run start time

Baltzell, Nathan requested to merge iss46b-scalers into development

Created by: baltzell

This is how things need to be done going forward, decoding the correct clock and using it for the Faraday offset calculation. The gotchas are:

  1. Data that was recorded when the clock's frequency was too large and rolled over within a run.
  2. Data that was decoded without preserving the correct clock.

Currently those are controlled by using the clock frequency from CCDB, currently set for RG-M and later to be usable, and for all previous runs to be unusable, with a threshold of 200 kHz.

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