[ENH] OWBoxPlot: add option to sort discrete distributions by size

[matejklemen]

Issue

Implements #3093.

Description of changes

Added option (checkbox) to allow sorting discrete distributions by their size. If checkbox is unchecked, original order is preserved.

Includes

• Code changes
• Tests
• Documentation

[codecov-io]

Codecov Report

Merging #3156 into master will increase coverage by 0.27%.
The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           master    #3156      +/-   ##
==========================================
+ Coverage   82.36%   82.63%   +0.27%     
==========================================
  Files         336      342       +6     
  Lines       58289    58995     +706     
==========================================
+ Hits        48011    48752     +741     
+ Misses      10278    10243      -35

[lanzagar]

Looks good, but sometimes while toggling the sorting the figure is not redrawn properly.
I tried it on cyber-security-breaches and changed Subgroups between None and US State, scrolled to the top of the visualization and then enabled/disabled sorting. Scrolling down and up forces the redraw and it again looks ok.
Needs some investigation.

[matejklemen]

Should be fixed now (i. e. I could not reproduce the issue anymore after d9fc998).

[astaric]

Works as expected.

I would change the test dataset to something smaller though.

[astaric]

can you use adult_sample? loading adult takes 0.5s to load on my computer, while loading adult_samples is instant.

[matejklemen]

Fixed, there really was no reason to use such a large dataset for testing this.

[astaric]

Thanks