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tasks/lalinference.py : more sophisticated decision of psdlength

Soichiro Morisaki requested to merge soichiro.morisaki/gwcelery:dataselection_PE into master

This patch enables it to determine psdlength and psdstart depending on whether data is available, correctly calibrated, observation-intent and taken while the interferometers are locked.

First, it sets long enough psdlength and searches for data during the target time. If parts of the data are unavailable, it throws away data except for the last continuously available data. Then it investigates GDS-STATE_VECTOR and extracts the data which has 1 in Bit 0 (HOFT_OK), 1 (OBSERVATION_INTENT) and 2 (OBSERVATION_READY). Finally it determines psdstart and psdlength from the remaining data.

cc: @vivien

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