plot_PCA: Plot a PCA analysis obtained with do_PCA
In leandroroser/PeixotoLabCode: Several functions for rna-seq analysis

Plot a PCA analysis obtained with do_PCA

plot_PCA(pc, level1, level2 = NULL, level1_name = "Treatment",
  level2_name = "Condition", interactive = FALSE, type = c("none",
  "polygons", "centroids"), draw_lines = FALSE, arrange_plots = TRUE,
  n = NULL, parallel = FALSE, line_size = 0.75)

`pc`	result of do_PCA function
`level1`	first treatment factor
`level2`	second treatment factor
`interactive`	Generate an interactive plot with plotly?
`n`	number of axes to plot. Default NULL (all)
`parallel`	parallel coordinates plot?
`line_size`	size of line for parallel coordinate plot