Merge tag 'v1.3.2'

AUTHORS.rst

doc/source/code/figure/closed_system.py.diff

doc/source/code/figure/spin_orbit.py.diff

doc/source/tutorial/faq.rst

doc/source/tutorial/first_steps.rst

kwant/_common.py

kwant/builder.py

kwant/continuum/_common.py

kwant/continuum/discretizer.py

kwant/continuum/tests/test_discretizer.py

kwant/lattice.py

kwant/linalg/mumps.py

kwant/operator.pyx

kwant/physics/leads.py

kwant/physics/tests/test_leads.py

kwant/plotter.py

kwant/solvers/common.py

kwant/system.py

kwant/tests/test_builder.py

kwant/tests/test_plotter.py