Change representation to display compartments
Implement operation compartment parsing
Enable compartment parsing in Service
Remove set_* methods from Model
Add assert guards
Fix error in parser model

- Fix error in parser model
- Change std.domm accordingly
- Fix error caused by change in tests
Add print method for partial parts of map
Add __getitem__ for Model class

- Add operator to Model class
- Fix tests to use it
Add __getitem__ method to Package; Tests use __getitem__ syntax