Issue #1787452 by danylevskyi: drush_delete_dir() doesn't delete symlinked files by default.
Issue #1957020 by JSCSJSCS, greg.1.anderson: drush sql-sync with --create-db does not work and can overwrite MySQL default databases
Prepare for 5.9
Back to 5.0-dev
Issue #1870580 by kevin.dutra: Drupal $base_url may not be set correctly
Issue #1899332 by TravisCarden: Improve code docs for drush_get_arguments().
Issue #1509936 by juampy, Danylo Dragan | filler: Fixed archive dump ard puts default.settings.php into the archive twice which errors on archive restore arr.
spelling fix.