Squashed 'ocaml-matrix/' changes from 6833ad1..ffeb22c
ffeb22c Add accessors, pp functions, and missing .mli files to ocaml-matrix
c98278f Fix all odoc documentation warnings in ocaml-matrix
git-subtree-dir: ocaml-matrix
git-subtree-split: ffeb22c17c8d6a7aff093c689fee4422040e198e