Add matter on CKX introduction.
Add some TODOs, add struction pseudocode skeleton.
Add new definitions.
Add custom enumeration package.
Add new crown-related definitions, state explicitly the transitive crown property.
Add new bibliography.
Add matter on CKX preliminaries.
Add matter on CKX struction operation.
Add matter on CKS general fold operation.
Add matter on CKX advantageous structures - domination.
Add matter on CKX good pairs.
Rename CKX preliminaries sss to make more sense.