calibration_parts.py:  lower resampler quality for lower latency and lower computational cost.  Also edits to exact kappas solution.

Added additional latency montioring to calibration pipeline. Exposed timestamp property in lal_latency.

this fixes the code (for some unknown reasons) falsely adding (some of the) GAP segments in the analyzed segment list
there is still a bug where segment of length 0 gets included in the segment table, but it won't affect the livetime

to save memory

for obtaining the segments analyzed

gstlal_feature_extractor_pipe: determine drop time based on fft length, split up combiner jobs into disjoint gps ranges

gstlal_feature_combiner: allow saving features to a separate directory, optionally pass in start, end times

utils.py: when saving features, only store time-based columns as double-precision, rest as single-precision

appears fix the issue people are having with injection jobs
occasionally hanging