Fix issue #271

[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

All modified and coverable lines are covered by tests ✅

Project coverage is 96.17%. Comparing base (da7737b) to head (3f81913).

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #439      +/-   ##
===============================================
+ Coverage        96.08%   96.17%   +0.09%     
===============================================
  Files               11       11              
  Lines             2250     2251       +1     
===============================================
+ Hits              2162     2165       +3     
+ Misses              88       86       -2     

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