Update CI config

Add .flake8 config file Add black experimental long string processing

.github/workflows/linting.yaml

@@ -28,6 +28,6 @@ jobs:
         run: |
           # stop the build if there are Python syntax errors or undefined names
           #flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-          flake8 . --count --max-line-length=79 --show-source --statistics
+          flake8 .
           # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
           #flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics