Move KKTresidual to its own file.
Scipy will not create a sparse matrix of size 0.
Remove outdated doc.
Add properties.
New NullVector type.
Phase out List.
Phase out old slacks class.
Formatting fixes.
Allow name kwarg for AmplModel.
Remove List.
Add L-BFGS module to model package.
Add augmented Lagrangian model.
Add quasi-Newton model.
Add new slack model.
Move L1 penalty to modeling module.
Update import of modeling module.
Update OSX build instructions.
Update modeling doc.
Fixup l1 merit function.
Phase out krylov.linop.