Add PCA plot script path to human config

Author: owenwilkins

prebuilt_configs/human_config_paired_star.yaml

@@ -21,6 +21,7 @@ picard_path: "picard"
 rsem_calc_exp_path: "rsem-calculate-expression"
 rsem_prep_ref_path: "rsem-prepare-reference"
 multiqc_path: "multiqc"
+pca_plot_script: "scripts/pca_plotting.py"
 
 ############################################# 
 # Custom Software Paths #####################