Setup linter

Use autopep8 to check all commits are linted correctly.

backend/secfit/runLinter.sh

+#! /bin/bash
+
+DIFF=$(python3 -m autopep8 --diff --recursive --aggressive .)
+
+if [ "$DIFF" = "" ];
+then
+    exit 0
+else
+    echo "Linter failed. See diff:"
+    echo $DIFF
+    exit 1
+fi