Refactoring and bug fixing in PlotTaxonomyCounts

[AgnesBaud]

Description

• BUG: Every plot regarding abundance when "Others" were calculated assumed that the dataframe was already relative abundance
• addition of the FigM2 prototype into the code (most abundant species represented in a boxplot, where every point was a sample relative abundance for the species in question)

Changelogs

• mode argument for plot_most_abundant_taxa() and plot_most_prevalent_taxa() that allows to plot the data as boxplot or violin plot, as well as a bargraph.

Issue(s)

Fixes #87

Definition of Done

• [x] New code is tested with unit tests
• [ ] Documentation has been updated
• [ ] Pull Request has been revised by a maintainer of the project

[codecov-commenter]

Codecov Report

Merging #89 (dca5330) into master (18b2248) will increase coverage by 5.37%. The diff coverage is 90.76%.

@@            Coverage Diff             @@
##           master      #89      +/-   ##
==========================================
+ Coverage   58.91%   64.28%   +5.37%     
==========================================
  Files          60       60              
  Lines        2714     2831     +117     
==========================================
+ Hits         1599     1820     +221     
+ Misses       1115     1011     -104     

Flag	Coverage Δ
unittests	64.28% <90.76%> (+5.37%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
moonstone/plot/graphs/heatmap.py	50.00% <ø> (ø)
moonstone/plot/graphs/scatter.py	29.41% <0.00%> (ø)
moonstone/plot/metadata.py	72.72% <57.89%> (+0.31%)	:arrow_up:
moonstone/plot/graphs/box.py	63.63% <66.66%> (ø)
moonstone/plot/graphs/violin.py	60.86% <66.66%> (+13.04%)	:arrow_up:
moonstone/plot/graphs/base.py	87.23% <81.81%> (ø)
moonstone/plot/graphs/bargraph.py	87.50% <83.78%> (+51.25%)	:arrow_up:
moonstone/plot/counts.py	96.52% <97.57%> (+45.13%)	:arrow_up:
moonstone/plot/graphs/histogram.py	100.00% <100.00%> (ø)
moonstone/utils/plot.py	96.66% <100.00%> (+1.92%)	:arrow_up:
... and 4 more

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