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Resurrect fake daq, fix DAQReader time conversion

Luca Scotto Lavina requested to merge resurrect_fake_daq into master

Created by: JelleAalbers

This resurrects the fake_daq script, used to mimic the DAQ on a regular computer. You must point it to a folder with raw_records data and tell it which run to read; it will then create "live records", if desired at a specific write rate.

Perhaps more importantly, this fixes a bug in the DAQReader's absolute time conversion (https://github.com/XENONnT/straxen/issues/17). A bare 1e9 was used, but that gives a float. Our times are 64-bit integers, so doing float math with them leads to inaccuracies. In this case, it led to records with fractional-sample times, which caused strange crashes later in strax.

(I also remove some unused old straxen contexts)

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