Fix some documentation and typos
Update Nate Collier's DMPlex tutorial to use newer notebook format and work with Python 3.
Add 'src/binding/petsc4py/' from commit '9d8b840ed7f345b561d77f5729d2e92238bc13e0'git-subtree-dir: src/binding/petsc4pygit-subtree-mainline: 2d88a74bccb5e37fbc4e61aca4ca0ae8418199f0git-subtree-sp
Add 'src/binding/petsc4py/' from commit '9d8b840ed7f345b561d77f5729d2e92238bc13e0'git-subtree-dir: src/binding/petsc4pygit-subtree-mainline: 2d88a74bccb5e37fbc4e61aca4ca0ae8418199f0git-subtree-split: 9d8b840ed7f345b561d77f5729d2e92238bc13e0
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