Add support for scalar addition, subtraction, and negation #151

	name: lint-test-cover-docs
	on:
	push
	jobs:
	lint_test_cover_docs:
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
	xcl: ['omit', 'install']
	name: "Python ${{ matrix.python-version }}"
	steps:
	- uses: actions/checkout@v3
	- name: Install Python.
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	architecture: x64
	- name: Install the optional rbcl and mclbn256 packages and associated dependencies.
	run: \|
	pip install -U .[rbcl,mclbn256]
	if: matrix.xcl == 'install'
	- name: Lint and test module.
	run: \|
	pip install -U .[lint,test]
	python -m pylint src/oblivious test/test_ristretto.py test/test_bn254.py # Check against linting rules.
	python -m pytest # Run tests.
	- name: Publish coverage results.
	run: \|
	pip install -U .[coveralls]
	python -m coveralls --service=github # Submit to coveralls.
	if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.8' && matrix.xcl == 'install'
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	- name: Test auto-generation of documentation.
	run: \|
	pip install -U .[docs]
	cd docs && sphinx-apidoc -f -E --templatedir=_templates -o _source .. && make html && cd ..

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