turn one function into an iterator + other minor details #86

	name: Fast Check
	on:
	push:
	workflow_dispatch:
	jobs:
	check:
	name: Make Check
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	python-version: [3.8]
	os: [self-hosted]
	steps:
	- name: Install dependencies
	run: \|
	if ! dpkg -s graphviz normaliz nauty libgsl-dev; then
	sudo apt-get install graphviz normaliz nauty libgsl-dev
	fi
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- uses: actions/checkout@v2
	- name: Install Python dependencies
	run: \|
	python3 -m pip install --upgrade pip
	make dependencies
	- name: Build
	run: \|
	make build
	- name: pytest Check
	run: \|
	python3 -m pytest --timeout=600 pySecDec
	- name: Doc Test
	run: \|
	export PYTHONPATH=$PWD
	make doctest
	- name: Util Check
	run: \|
	export PYTHONPATH=$PWD
	make util-check -j2
	- name: High-level Tests
	run: \|
	export PYTHONPATH=$PWD
	make -C high_level_tests runselected -j2
	- name: High-level Test Summary
	run: \|
	export PYTHONPATH=$PWD
	make -C high_level_tests summarize-selected

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