GrupoCorpodatRecords Code

- Delegation pre-selected automatically.
- Just own delegation (and subdelegations) added to comboBox.
@ ClientsPanel:
- Fixed comment update (no repetitions now).
- Fixed payment save (wasn't saving it).
- Fixed payment loading (was always loading bank account).
@ CoursesPanel:
- Fixed students update (was no updating data and deleting student sometimes).