Use more clear number of pbkdf2 iterations in the config file

config.py

@@ -13,10 +13,10 @@ SECRET_KEY = os.environ.get( "SECRET_KEY", utils.rand.random_data( 20 ) )
 
 MAX_CONTENT_LENGTH = 500 * 1024 * 1024
 
-EMAIL_NB_ITERATIONS = 50000
-PASSWORD_NB_ITERATIONS = 50000
-DEK_NB_ITERATIONS = 500000
-CF_NB_ITERATIONS = 100000
+EMAIL_NB_ITERATIONS = 50 * 1000
+PASSWORD_NB_ITERATIONS = 50 * 1000
+DEK_NB_ITERATIONS = 500 * 1000
+CF_NB_ITERATIONS = 100 * 1000
 
 EMAIL_SALT_LENGTH = 65
 PASSWORD_SALT_LENGTH = 100