Manual alignment fixes.
Further PEP8 fixes not caught by autopep8
Remove overriden property norm from Dat
Remove overriden property c_vec_dec from Arg
Add missing decorator import
Remove unused variables and imports
More whitespace fixes discovered by flake8
Add module level list of public object to op2
Selectively ignore flake8 warnings
More PEP8 fixes for demos
More PEP8 fixes for unit tests
Flake8 fixes for demos
Flake8 fixes for unit tests
PEP8 for regression
flake8 for regression tests
Flake8 fixes for setup.py
Add flake8 configuration to tox.ini
Add make target lint to run flake8 code linter