Diploid testing: merge forward-backward and viterbi testing

[astheeggeggs]

This combines together test_genotype_matching_fb.py and test_genotype_matching_viterbi.py to avoid redundant code.

[codecov]

Codecov Report

Merging #2798 (bcc01e5) into main (2f4c8f4) will decrease coverage by 13.30%.
The diff coverage is n/a.

❗ Current head bcc01e5 differs from pull request most recent head 09ae207. Consider uploading reports for the commit 09ae207 to get more accurate results

@@             Coverage Diff             @@
##             main    #2798       +/-   ##
===========================================
- Coverage   89.79%   76.49%   -13.30%     
===========================================
  Files          30       29        -1     
  Lines       29474    28322     -1152     
  Branches     5737     5308      -429     
===========================================
- Hits        26465    21666     -4799     
- Misses       1726     5341     +3615     
- Partials     1283     1315       +32     

Flag	Coverage Δ
c-tests	86.24% <ø> (+0.14%)	⬆️
lwt-tests	80.13% <ø> (-0.66%)	⬇️
python-c-tests	67.12% <ø> (-0.77%)	⬇️
python-tests	?

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see 19 files with indirect coverage changes

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[jeromekelleher]

I think it's worth learning how to do rebasing @astheeggeggs - the history is a mess here and it'll make your life miserable. Ben or I can take you through it if the docs here aren't clear

[jeromekelleher]

Looks good, will need a rebase once #2799 lands (which brings in lshmm 0.0.5)