Allow elementwise functions to process array scalars #1348

Job	Run time
Flake8	17s
Documentation	6m 52s
Tests for downstream project meshmode	22m 21s
Tests for downstream project grudge	14m 5s
Tests for downstream project mirgecom	3s
Tests for downstream project mirgecom_examples	3s
Examples Conda Py3	5m 21s
Mypy	4m 38s
Pytest Conda Py3 Intel	6m 29s
Pylint	5m 1s
Pytest Conda Py3 POCL	6m 10s
	1h 11m 20s

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