Feature/report grouped ranks

[pirovc]

• Enable reporting of multiple ranks in one level if they are independent in the taxonomy having no nodes in common

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 21.62162% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.58%. Comparing base (af00a99) to head (2e82da4).
⚠️ Report is 187 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/ganon/report.py	21.62%	29 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #337       +/-   ##
===========================================
+ Coverage   77.66%   88.58%   +10.92%     
===========================================
  Files          22       24        +2     
  Lines        2512     3873     +1361     
===========================================
+ Hits         1951     3431     +1480     
+ Misses        561      442      -119     

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