Given a list of labeled real-valued vectors and a significance level alpha, generate a graph with vertices corresponding to the list's labels where two vertices are connected by an edge if the corresponding vectors have a correlation coefficient that is positive or negative at the specified significance level. An object creating the graph should support the plot method, which will plot the generated graph using a circular layout.

CC: @dcoudert

Component: graph theory

Keywords: sagedays@icerm

Author: Robert Kingan

Issue created by migration from https://trac.sagemath.org/ticket/25933