Reimplement Network from Distances

[janezd]

Issue

Fixes #250. Fixes #248. Fixes #243.

Description of changes

Reimplementation of Network from Distances. Widget is cleaner and leaner.

• The new implementation allows setting the number of edges or density (or threshold, as before). All of these can be edited numerically or set in a graph.
• The widget handles asymmetric matrices (should we have any).
• Instead of histogram with number of edges at a particular distances, the graph is now cumulative; this allows for showing the threshold and the number of edges in the same graph.
• Creating network of closest neighbors is removed to a separate widget.
• Extracting the largest components / removal of small components is not longer possible. It may resurrect in a separate widget, dedicated to selection of components.
• Better tests.

Network of Neighbours: A new widget with functionality that used to clutter the Network from Distances widget.

TODO: Documentation will be written upon approval by @ajdapretnar. Preferably, it would be written by @ajdapretnar, thanks in advance. :)

Includes

• Code changes
• Tests
• Documentation

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9279386) 73.76% compared to head (aa6f2fc) 76.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #268      +/-   ##
==========================================
+ Coverage   73.76%   76.04%   +2.27%     
==========================================
  Files          21       23       +2     
  Lines        2977     3085     +108     
==========================================
+ Hits         2196     2346     +150     
+ Misses        781      739      -42     

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[ajdapretnar]

I love it. I'll write the docs separately, if that's ok?

[janezd]

I love it. I'll write the docs separately, if that's ok?

Sure. I wrote an issue lest we forget.