SAINT GENET by Jean-Paul Sartre 625 pages. Braziller. $8.50.
OUR LADY OF THE FLOWERS by Jean Genet. 318 pages. Grove. $6.50.
"Jean Genet is an artist," proclaimed the President of the French Republic in 1948, pardoning him from a life sentence for repeated burglaries. "Jean Genet is a criminal and a pornographer," shrilled all the proper Parisiens, promptly seeing to it that even in Paris Genet's writings for years could be sold only under the counter. "Jean Genet is a saint," declares Jean-Paul
Sartre, high priest of French existentialism. "I am a pederast. I am a...