setup: Merge .flake8 with setup.cfg

Author: jcfr

.flake8

@@ -1,3 +1,14 @@
+[flake8]
+max-line-length: 80
+# Whether to display the pep8 instructions on failure (can be quite verbose)
+show-pep8: False
+# Whether to show source code for each failure
+show-source: True
+# Maximum cyclomatic complexity allowed
+max-complexity: 14
+format: pylint
+exclude: .git,.idea,.eggs,__pycache__,.tox,_skbuild,src,versioneer.py
+
 [versioneer]
 VCS = git
 versionfile_source = cmake/_version.py