2. Ensure backup should work with '--data-only' and '--schema-only' for any format. Fixes#3347
3. Added supported "Dump Options" for "pg_dumpall" which was not there since pgAdmin 3.
4. Fixed issue where "--clean" should not clubbed with "--data-only" while taking backup.
5. Fixed "--oids" should not clubbed with "--inserts" or "--column-inserts" while taking backup.
Extract some of the ACI Tree functionalities, and decouple it from the
main source. Also - create some abstractions from the repeated code
around the enable/disable the schema children object create/edit/delete
functionalities, and also created the dialog wrappers for backup and
restore dialogs.
Reviewed by: Khushboo and Ashesh
Refactored by: Ashesh
