Bug fix: update infer_data_source with a tdiff tolerance and add extra columns to be renamed

[emmleroy]

1. Several MOD-UFP files from the database have a dominant sampling interval of 58s or 59s, rather than 60s. This updates infer_data_source() with a 2-second tolerance around the expected dominant_tdiff values.

2. A couple old column names need to be added to COLUMN_DEFINITIONS: (opcn3_temp --> opc_temp, opcn3_rh --> opc_rh, operating_state --> dd_operating_state).

3. Bug fix: neph_bin0/opc_bin0 ratio check should occur when neph_bin0>=10, not when opc_bin0>=10 (following fw-modulair v17?)

4. Fix: some int64 columns need to be nullable (fw, dd_operating_state, dd_measurement_state) for older data that doesn't have these values; changed dtype to float64

5. Speed-up flag-aware resampling by changing to a vectorized version

6. Bump pre-release version to rc4

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.19%. Comparing base (20f6aa3) to head (f7d9b35).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
quantaq_cli/toolkit/resample.py	94.44%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## master #39 +/- ##
==========================================
+ Coverage 91.82% 92.19% +0.36% 
==========================================
Files 24 24 Lines 1260 1255 -5 ==========================================
Hits 1157 1157 + Misses 103 98 -5 

Flag	Coverage Δ
unittests	92.19% <95.45%> (+0.36%)	⬆️

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Files with missing lines	Coverage Δ
quantaq_cli/schema.py	93.05% <ø> (-1.39%)	⬇️
quantaq_cli/utilities.py	82.85% <100.00%> (+0.24%)	⬆️
quantaq_cli/variables.py	90.00% <ø> (ø)
quantaq_cli/toolkit/resample.py	94.59% <94.44%> (+7.09%)	⬆️

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