Structural changes

[DariuszDepta]

Implementation of structural changes to the decision table.

• Adding/inserting/deleting input clauses: (add separate issue)
• Adding/inserting/deleting output clauses: (add separate issue)
• Adding/inserting/deleting annotation clauses: (add separate issue)
• Adding/inserting/deleting rules: (add separate issue)
• Autonumbering rules: (add separate issue)
• Adding/deleting information item name: (add separate issue)
• Adding/deleting output label: (add separate issue)