Updated triangle ancestry plot to include unknowns and QC. Updated to subject-level to ensure QC are project QC rather than internal QC. Ensure cases are plotted on top for max visibility
Standardized colors across plots by creating dictionary mapping labels (case, control, QC, unknown) to specific colors (chosen to ensure colorblind friendly)
Removed unused plot_ancestry_grafpop.py script
In plot autosomal heterozygosity script, updated plot title from "Homozygosity F Coefficient" to "Heterozygosity F Coefficient" per more common use decided by Jia/Jiahui
Fix #237