Pipeline run fixes

[martin-springer]

• Code changes are covered by tests
• Code changes have been evaluated for compatibility/integration with TrendAnalysis
• New functions added to __init__.py
• API.rst is up to date, along with other sphinx docs pages
• Example notebooks are rerun and differences in results scrutinized
• Updated changelog

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.17%. Comparing base (bd86075) to head (924bdb3).

Files with missing lines	Patch %	Lines
rdtools/analysis_chains.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #450      +/-   ##
===============================================
- Coverage        96.21%   96.17%   -0.05%     
===============================================
  Files               12       12              
  Lines             2274     2276       +2     
===============================================
+ Hits              2188     2189       +1     
- Misses              86       87       +1     

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[mdeceglie]

Looks good. Thanks @martin-springer