Include Richardson-Lucy methods

[BjoernLudwigPTB]

These changes have been introduced in August 2019 with the comment: "[...] needs further testing and comment". Maybe the time has come to do that?!

[codecov-commenter]

Codecov Report

Merging #228 (85b3e45) into master (329eb0c) will decrease coverage by 0.13%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #228      +/-   ##
==========================================
- Coverage   74.12%   73.98%   -0.14%     
==========================================
  Files          29       29              
  Lines        2191     2191              
  Branches      364      364              
==========================================
- Hits         1624     1621       -3     
- Misses        427      429       +2     
- Partials      140      141       +1     

Impacted Files	Coverage Δ
src/PyDynamic/model_estimation/fit_filter.py	85.80% <0.00%> (-1.00%)	:arrow_down:

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[BjoernLudwigPTB]

This PR is 5 years old and it seems, as if there was no need for it to be released with one of the intermediate PyDynamic versions. We will close it now, as the project is about to be archived.