Add checks to filter arguments for TrendAnalysis (Issue #377)

[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 95.34884% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.08%. Comparing base (58b00e1) to head (2479e35).

Files with missing lines	Patch %	Lines
rdtools/analysis_chains.py	95.34%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #436      +/-   ##
===============================================
- Coverage        96.10%   96.08%   -0.02%     
===============================================
  Files               11       11              
  Lines             2209     2250      +41     
===============================================
+ Hits              2123     2162      +39     
- Misses              86       88       +2     

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[mdeceglie]

The solution works great! Let's add some simple tests for the intended behavior

[martin-springer]

The solution works great! Let's add some simple tests for the intended behavior

Done.

[mdeceglie]

Thank you for adding the unit tests. I suggest we also add some simple tests to the trend analysis as well: checking that every key we think should work does work (including ad_hoc) and checking that some bogus key in either filter_params or filter_params_aggregated raises an error

[martin-springer]

Thank you for adding the unit tests. I suggest we also add some simple tests to the trend analysis as well: checking that every key we think should work does work (including ad_hoc) and checking that some bogus key in either filter_params or filter_params_aggregated raises an error

added