update haskell tree generation script
Merge branch 'develop' of github.com:casadi/casadi into develop
Merge branch 'develop' of github.com:casadi/casadi into develop
Merge branch 'develop' of github.com:ghorn/casadi into develop
Merge branch 'develop' of github.com:ghorn/casadi into develop
add ipopt #defines from pkg-config, closes #1010
Merge pull request #1011 from ghorn/develop

haskell tree and ipopt #defines