ENH: support QOIs and better dark query handling

[CJ-Wright]

No description provided.

[codecov-io]

Codecov Report

Merging #208 into master will decrease coverage by 4.06%.
The diff coverage is 44.54%.

@@            Coverage Diff             @@
##           master     #208      +/-   ##
==========================================
- Coverage   84.93%   80.87%   -4.07%     
==========================================
  Files          27       30       +3     
  Lines        1095     1171      +76     
==========================================
+ Hits          930      947      +17     
- Misses        165      224      +59

Impacted Files	Coverage Δ
xpdan/pipelines/qoi.py	0% <0%> (ø)
xpdan/startup/analysis.py	0% <0%> (ø)	⬆️
xpdan/pipelines/save.py	100% <100%> (ø)
xpdan/tests/test_main_pipeline.py	100% <100%> (ø)	⬆️
xpdan/pipelines/vis.py	100% <100%> (ø)
xpdan/pipelines/main.py	100% <100%> (ø)	⬆️
xpdan/tests/test_main_pipeline_extra.py	100% <100%> (ø)	⬆️
xpdan/db_utils.py	95% <60%> (-2.37%)	⬇️
... and 1 more

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[CJ-Wright]

The errors are flake8 and this needs to go in. I will fix the flake8 errors after the tag.