Weighted Correlation Network Analysis

 Functions necessary to perform Weighted Correlation Network Analysis
 on high-dimensional data as originally described in Horvath and Zhang
 (2005) <doi:10.2202/1544-6115.1128> and Langfelder and Horvath (2008)
 <doi:10.1186/1471-2105-9-559>. Includes functions for rudimentary data
 cleaning, construction of correlation networks, module identification,
 summarization, and relating of variables and modules to sample
 traits. Also includes a number of utility functions for data manipulation
 and visualization.