will no longer fail for insanely small i/sigma

[kmdalton]

I updated the French Wilson algorithm so that it wouldn't output NaNs for very small values of I/SigI, and I updated some tolerances in the test. I made them a little bit looser. Now we have to agree within %5 to the table in the paper, and 95% of the reflections must be within 2% of the values from PHENIX. I also got rid of unused posterior functions.

[codecov-io]

Codecov Report

Merging #46 (e7b8c8f) into master (a20d6c0) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
- Coverage   99.17%   99.17%   -0.01%     
==========================================
  Files          34       34              
  Lines        1333     1330       -3     
==========================================
- Hits         1322     1319       -3     
  Misses         11       11              

Flag	Coverage Δ
unittests	99.17% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
...alspaceship/algorithms/scale_merged_intensities.py	100.00% <100.00%> (ø)

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