Configure code checking and formatting tools

Checking
- mypy
- flake8 (which uses pyflakes and pycodestyle)

Formatting
- autopep8
- isort

scripts/check

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+mypy PFERD
+flake8 PFERD

scripts/format

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+autopep8 --recursive --in-place PFERD
+isort PFERD

scripts/setup

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+pip install --upgrade pip setuptools
+pip install --editable .
+pip install --upgrade mypy flake8 autopep8 isort