Draft: Adjust lpy saturation threshold based on suspensions being plotted, add magnet signs to lpy map, use ETMX L3 if no saturations

1.) Changes saturation threshold based on whether suspension channels are 16, 18, or 20-bit.

ETMX L3 lpy plot before: Screen_Shot_2020-07-08_at_2.46.27_PM

ETMX L3 lpy plot after: Screen_Shot_2020-07-08_at_3.24.56_PM

2.) It turns out the coil driver magnet signs were forgotten when creating the lpy maps. I have expanded the map to include the many different magnet sign configurations, though it may make more sense to the new viewer if I create a separate matrix to multiply lpy_map by.

Previous lpy summing: https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/events/1267/771084/lpy_WIDE.png

New lpy summing: https://ldas-jobs.ligo-wa.caltech.edu/~yannick.lecoeuche/events/1267/771084/lpy_WIDE.png

3.) Uses ETMX L3 if there are no saturating suspensions for the event.

Previous event page: https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1268953680

New event page: https://ldas-jobs.ligo-wa.caltech.edu/~yannick.lecoeuche/index.cgi?event=1268953680

4.) Adds TMS to checked LHO suspensions and incorporates TMS/ETM channels at LLO that were switched to 20-bit.

Previous LLO ETM sat suspensions: https://ldas-jobs.ligo-la.caltech.edu/~lockloss/events/1282/078822/saturations_WIDE.png

New LLO ETM sat suspensions: https://ldas-jobs.ligo-la.caltech.edu/~yannick.lecoeuche/events/1282/078822/saturations_WIDE.png

Closes #163 (closed), #164 (closed), #167 (closed)