Closes #210 clean documentation

[pchelle]

No description provided.

[Yuri05]

@pchelle As this PR is on documentation: there are still a few warnings in the build log:

 checking for missing documentation entries ... WARNING
Undocumented code objects:
  'Percentile0%' 'Percentile1%' 'Percentile10%' 'Percentile100%'
  'Percentile15%' 'Percentile2.5%' 'Percentile20%' 'Percentile25%'
  'Percentile25%-1.5IQR' 'Percentile5%' 'Percentile50%' 'Percentile75%'
  'Percentile75%+1.5IQR' 'Percentile80%' 'Percentile85%'
  'Percentile90%' 'Percentile95%' 'Percentile97.5%' 'Percentile99%'
  'mean+1.96sd' 'mean+sd' 'mean-1.96sd' 'mean-sd' 'median+1.5IQR'
  'median+IQR' 'median-1.5IQR' 'median-IQR'
All user-level objects in a package should have documentation entries.
See chapter 'Writing R documentation files' in the 'Writing R
Extensions' manual.
* checking for code/documentation mismatches ... OK
* checking Rd \usage sections ... WARNING
Documented arguments not in \usage in documentation object 'getLegendCaption':
  'captionData' 'which'
Functions with \usage entries need to have the appropriate \alias
entries, and all their arguments documented.
The \usage entries must correspond to syntactically valid R code.
See chapter 'Writing R documentation files' in the 'Writing R
Extensions' manual.

[codecov-commenter]

Codecov Report

Merging #211 (e2f393a) into develop (630ab34) will increase coverage by 0.65%.
The diff coverage is 100.00%.

❗ Current head e2f393a differs from pull request most recent head ab01ca3. Consider uploading reports for the commit ab01ca3 to get more accurate results

@@             Coverage Diff             @@
##           develop     #211      +/-   ##
===========================================
+ Coverage    47.06%   47.72%   +0.65%     
===========================================
  Files           57       56       -1     
  Lines         2624     2588      -36     
===========================================
  Hits          1235     1235              
+ Misses        1389     1353      -36     

Impacted Files	Coverage Δ
R/aggregation-input.R	90.69% <ø> (ø)
R/atom-plots.R	77.46% <ø> (ø)
R/boxwhisker-datamapping.R	0.00% <ø> (ø)
R/boxwhisker-get-measure.R	0.00% <ø> (ø)
R/boxwhisker-plotconfiguration.R	0.00% <ø> (ø)
R/datamapping-grouping.R	84.61% <ø> (ø)
R/datamapping-groupmapping.R	100.00% <ø> (ø)
R/datamapping-range.R	62.06% <ø> (ø)
R/datamapping-xy.R	30.76% <ø> (ø)
R/datamapping-xygroup.R	94.59% <ø> (ø)
... and 30 more

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