#1004624 by jonhattan. Improve error message and give remedy intructions - It's a security risk to have a backup folder in your Drupal root.

#1011260 by greg.1.anderson: Unify command help so that help options do not begin with '--' in command help.

#938336 by greg.1.anderson: propagate Drupal site context options (local or remote) into aliases used with sql-sync.

Don't return FALSE from a validate hook unless we really mean it. It matters now. drush_pm_updatecode_validate().