add legal and other meta information

kwant/solvers/__init__.py

kwant/solvers/common.py

kwant/solvers/default.py

kwant/solvers/mumps.py

kwant/solvers/sparse.py

kwant/solvers/tests/_test_sparse.py

kwant/solvers/tests/test_mumps.py

kwant/solvers/tests/test_sparse.py

kwant/system.py

kwant/tests/test_builder.py

kwant/tests/test_lattice.py

kwant/tests/test_plotter.py

kwant/tests/test_system.py

kwant/version.py

setup.py