pgAdmin 4 commit: 1. Added new backup/restore options for PostgreSQL 11

1. Added new backup/restore options for PostgreSQL 11. Fixes #3503
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.

Branch
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master

Details
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https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=0ab1305ddf5ef51136110c202c2da3f0c52940e3

Modified Files
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docs/en_US/backup_dialog.rst | 12 +-
docs/en_US/backup_server_dialog.rst | 60 +++-
docs/en_US/images/backup_do_not_save.png | Bin 40334 -> 61640 bytes
docs/en_US/images/backup_queries.png | Bin 48381 -> 96365 bytes
docs/en_US/images/backup_server_disable.png | Bin 0 -> 87018 bytes
docs/en_US/images/backup_server_do_not_save.png | Bin 0 -> 96918 bytes
docs/en_US/images/backup_server_general.png | Bin 48633 -> 107440 bytes
docs/en_US/images/backup_server_miscellaneous.png | Bin 0 -> 101769 bytes
docs/en_US/images/backup_server_objects.png | Bin 0 -> 81861 bytes
docs/en_US/images/backup_server_queries.png | Bin 0 -> 93072 bytes
docs/en_US/images/restore_do_not_save.png | Bin 36417 -> 116898 bytes
docs/en_US/release_notes_3_3.rst | 2 +
docs/en_US/restore_dialog.rst | 2 +
web/pgadmin/tools/backup/__init__.py | 236 +++++----------
web/pgadmin/tools/backup/static/js/backup.js | 137 +++++++--
.../tests/test_backup_create_job_unit_test.py | 250 +++++++++++++++-
web/pgadmin/tools/restore/__init__.py | 27 +-
web/pgadmin/tools/restore/static/js/restore.js | 14 +
web/pgadmin/tools/restore/static/js/restore.js.rej | 322 ---------------------
.../tests/test_restore_create_job_unit_test.py | 35 +++
20 files changed, 559 insertions(+), 538 deletions(-)