Enable F841: unused local

examples/curve-pot.py

examples/expansion-toys.py

pyproject.toml

sumpy/expansion/m2l.py

sumpy/p2p.py

sumpy/tools.py

sumpy/toys.py

test/test_cse.py

test/test_fmm.py

test/test_kernels.py

test/test_qbx.py

test/test_tools.py