Change seismic thresholds at LHO/LLO
Simple change, changes LHO seismic tag threshold from 40 to 300 and the LLO threshold from 500 to 600. These numbers are approximate, the result of discussion between Arnaud and Sheila.
Example seismic plot with revised thresold: https://ldas-jobs.ligo-wa.caltech.edu/~yannick.lecoeuche/events/1258/592494/seismic.png
Closes #133 (closed)