Consistency tests

[pauladkisson]

Depends on #191

Fixes #206

Branches of the pipeline to test:

• combine data
• artifact removal
• z_score_method
• isosbestic control
• compute cross correlation
  • The cross-correlation option actually fails on the v1.3.0 (at least on Mac) because the spec file specifies Python 3.6 and scipy 1.5. However, the scipy.signal.correlation_lags function wasn't introduced to scipy until version 1.6, which requires Python 3.7+.
  • To cover this case, I added an integration test rather than a consistency test.
• average group
• dff instead of z-score for step 5

This PR also fixes the following bugs that were revealed by the consistency tests:

• When combine_data = True, corrected_timestamps were incorrectly assigned to the ttl_timestamps. Now the TTL timestamps are computed properly.
• When combine_data = True, combine_storesList.csv was not created. Now it is.

[codecov]

Codecov Report

❌ Patch coverage is 60.46512% with 85 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/guppy/testing/consistency.py	57.14%	57 Missing and 15 partials ⚠️
src/guppy/orchestration/preprocess.py	40.00%	4 Missing and 5 partials ⚠️
src/guppy/orchestration/transients.py	20.00%	3 Missing and 1 partial ⚠️

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