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Add IFO-specific 20-bit DAC suspension channels

Yannick Lecoeuche requested to merge yannick.lecoeuche/locklost:L1_20bit_fix into master

Recently it was realized that the 4x output reduction on ETMX L3 channels that we perform for LHO does not apply for LLO, and that LLO has its own 20-bit channels that need reduction (ETMY L3 channels). Site-specific 20-bit channels have been designated, as well as dates when those 20-bit DAC switches were implemented.

LLO accidentally-increased ETMY saturation: https://ldas-jobs.ligo-la.caltech.edu/~lockloss/events/1259/568498/saturations_ZOOM.png

LLO corrected ETMY saturation: https://ldas-jobs.ligo-la.caltech.edu/~yannick.lecoeuche/events/1259/568498/saturations_ZOOM.png

LLO accidentally-reduced ETMX saturation: https://ldas-jobs.ligo-la.caltech.edu/~lockloss/events/1259/435400/saturations_WIDE.png

LLO corrected ETMX saturation: https://ldas-jobs.ligo-la.caltech.edu/~yannick.lecoeuche/events/1259/435400/saturations_WIDE.png

Closes #136 (closed)

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