drush 6.x-4.0-rc6

Changes since DRUPAL-6--4-0-RC5:

• #985254 by greg.1.anderson: Shared .bashrc for core-cli
• Clarify that hook_command_help is optional.
• #880154. Add example for running a .sql file against current DB to sql-query help.
• #1000662 by jonhattan. --bzrsync not working due to reserved files check.
• #1010642 by jonhattan: clean up commands help messages
• #938336 by greg.1.anderson: Document command-specific in alias records
• #1008118 by greg.1.anderson: Standardize on 'return drush_user_abort();' as correct way to stop execution when user cancels
• #1010954 by greg.1.anderson: Correct 'help core-status' argument text to match behavior.
• #1010984 by greg.1.anderson: Allow aliases to define command-specific options that only apply when alias is used as source or target of rsync / sql-sync
• #698078 by Garrett Albright. sqlite site-install docs.
• Avoid notice during site-install with sqlite.
• #1010238 by moshe weitzman. Clarify site-upgrade description.
• #1011074 by greg.1.anderson: Rename the 'options' context to 'cli'.
• #918304: allow sql-sync to use local alias file
• #1010630 by greg.1.anderson: make --quiet silence log messages too
• Don't return FALSE from a validate hook unless we really mean it. It matters now. drush_pm_updatecode_validate().
• Properly escape each file as its own argument in bzr pre_update()
• #985254 by greg.1.anderson: Add contextual command support to core-cli; add
• #1011008 by greg.1.anderson: sql-sync should automatically set --ordered-dump option
• #1004876 by chx. Can't use custom database driver.
• #938336 by greg.1.anderson: propagate Drupal site context options (local or remote) into aliases used with sql-sync.
• #985254 by greg.1.anderson: Do not attempt to 'cd' to a remote machine in core-cli