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. Bump pre-release version to rc4

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.83%. Comparing base (20f6aa3) to head (43458cf).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #39   +/-   ##
=======================================
  Coverage   91.82%   91.83%           
=======================================
  Files          24       24           
  Lines        1260     1261    +1     
=======================================
+ Hits         1157     1158    +1     
  Misses        103      103           

Flag	Coverage Δ
unittests	91.83% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
quantaq_cli/schema.py	94.44% <ø> (ø)
quantaq_cli/utilities.py	82.85% <100.00%> (+0.24%)	⬆️

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