Move data models to the top package.
Move pipeline to the top package.
Move demos to src.
Update imports, add skip_if decorator.
Catch ImportError when libOsiSym.so cannot be located.
Fix NOTICE.
Update comments.
Build problem from scratch.
Add class logger, add few check points.
Add base generator class.
Add another col solution check test.
Add a few check points, fix comments.
Use new generator base class, update tests names.
Use new data model API.