Draw Delaunay Triangulation and Circumcircles

[romsson]

Delaunay Triangulation https://en.wikipedia.org/wiki/Delaunay_triangulation

Circumcircles http://bl.ocks.org/zanarmstrong/b1c051113be144570881

[severo]

[severo]

Must include:

• [ ] automatically draw the Delaunay edges between nodes
• [ ] allow the user to delete some edges
• [ ] maybe: allow the user to add new edges
• [ ] allow the user to set a label: "20 MIN" (, a value : "20" ?) and a category "blue" to each edge
• [ ] place the labels on the edges

Note that in this case, we would want to add a base map layer - see https://github.com/LyonDataViz/occupapp/issues/37

Also:

• [ ] add rules? such as: don't create edges below or beyond a given distance