Merge branch 'master' into ignore-isl-identifiers

.gitlab-ci.yml

doc/index.rst

doc/misc.rst

doc/ref_kernel.rst

doc/tutorial.rst

loopy/check.py

loopy/codegen/__init__.py

loopy/codegen/bounds.py

loopy/codegen/control.py

loopy/codegen/loop.py

loopy/execution.py

loopy/isl_helpers.py

loopy/kernel/__init__.py

loopy/kernel/creation.py

loopy/kernel/data.py

loopy/kernel/tools.py

loopy/preprocess.py

loopy/schedule/__init__.py

loopy/statistics.py

loopy/symbolic.py