*heatmap.2 function:
https://davetang.org/muse/2010/12/06/making-a-heatmap-with-r/
*ComplexHeatmap package:
http://bioconductor.org/packages/release/bioc/html/ComplexHeatmap.html
*pheatmap package:
https://davetang.org/muse/2018/05/15/making-a-heatmap-in-r-with-the-pheatmap-package/
*superheat package:
https://davetang.org/muse/2017/02/06/making-heatmap-r-superheat-package/ (can add side plots)
*heatmap3 package:
https://cran.r-project.org/web/packages/heatmap3/vignettes/vignette.pdf
- other information: http://compbio.ucsd.edu/making-heat-maps-r/