Simplify the license a bit: MIT.
Squashed 'External/Lagrangian/' changes from c3f5d01..3c683a0

3c683a0 MIT license.

git-subtree-dir: External/Lagrangian
git-subtree-split: 3c683a0e7fecb32fec5d5e83a79623bdfb9fbf51
Merge commit '9df75565384f915460e1c558ddd912835cd55ed6'