Updates .flake8 for longer line length and to use EXE and S

.flake8

 ; vim: set ft=dosini :
 
 [flake8]
+max-line-length = 120
 select =
 	# pycodestyle errors
 	E,
+	# flake8-executable - https://pypi.org/project/flake8-executable/
+	EXE,
 	# pyflakes
 	F,
-	# bandit security
+	# bandit security - https://pypi.org/project/flake8-bandit/
 	S,
 	# pycodestyle warnings
 	W,
 ignore =
-	# line break before binary operator, use W504
+	# W503 = warn about "line break before binary operator"
+        # W504 = warn about "line break after binary operator"
+        # ignore W503 = allow W503, not W504
+        # see https://peps.python.org/pep-0008/#should-a-line-break-before-or-after-a-binary-operator
 	W503,
 exclude =
 	__pycache__,