Add additional password hash algorithms (closes #5859) (#6023)

custom/conf/app.ini.sample

@@ -319,6 +319,8 @@ MIN_PASSWORD_LENGTH = 6
 IMPORT_LOCAL_PATHS = false
 ; Set to true to prevent all users (including admin) from creating custom git hooks
 DISABLE_GIT_HOOKS = false
+; Password Hash algorithm, either "pbkdf2", "argon2", "scrypt" or "bcrypt"
+PASSWORD_HASH_ALGO = pbkdf2
 
 [openid]
 ;