Remove unused variables

When unused variables had previously been used in now commented out code,
they were commented out as well instead of completely removed.
Remove Empty menu. (see #12157)
Remove commented out code
Remove commented out code
Flake8 test_servants.py
Flake8 test_servants.py
Flake8 test_hdfstorage.py
Flake8 tablestest library.py
Flake8 test_prototypes.py
Flake8 test_processor.py
Flake8 test_parse.py
Flake8 test_tempfiles.py
Flake8 test_rtypes.py
Flake8 test_python_only.py
Flake8 test_permissions.py
Flake8 test_parameters.py
Flake8 test_model.py
Flake8 test_ext.py
Flake8 test_config.py
Flake8 test_clients.py