RdTools 3.0

[mdeceglie]

• [ ] 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

[mdeceglie]

Very early draft for now

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.95624% with 66 lines in your changes missing coverage. Please review.

Project coverage is 96.09%. Comparing base (f64428f) to head (c37ca59). Report is 62 commits behind head on development.

Files	Patch %	Lines
rdtools/soiling.py	90.20%	48 Missing :warning:
rdtools/analysis_chains.py	93.64%	11 Missing :warning:
rdtools/plotting.py	90.62%	3 Missing :warning:
rdtools/degradation.py	93.54%	2 Missing :warning:
rdtools/filtering.py	98.88%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #390 +/- ## ================================================ + Coverage 69.96% 96.09% +26.12% ================================================ Files 12 11 -1 Lines 2111 2200 +89 ================================================ + Hits 1477 2114 +637 + Misses 634 86 -548 ```

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