Functions for common QC and phenotype level plots

[abearab]

• transfer codes from https://github.com/mhorlbeck/ScreenProcessing/blob/master/screen_analysis.py

QC plots

• Phenotype scatter plot for replicates as a QC analysis #22
• Histogram of guide counts distribution
• PCA plot
  • Principal component analysis (PCA) of guide level phenotypes #9

phenotype plots

• Rank plot of phenotypes
• Functions for phenotype volcano plots
• Functions for phenotype scatter plots

[abearab]

@isabelleliuu do you want to help adding these features?