Remove obsolete help text
Issue #2030311 by helmo: Fixed testUnknownOptions fails on PHP 5.4.
Issue #2041165 by greg.1.anderson, greggles: Overlapping jobs - files getting clobbered in sql-sync?
Issue #2042565 by greg.1.anderson | moshe weitzman: Fixed @self alias is missing its path-aliases definitions.
Issue 2042575 by greg.1.anderson: Fix site database credential caching, so that Drush sql-sync will not call sql-conf more times than necessary.
Remove a few lingering references to #id
Issue #2043891 by greg.1.anderson | Jim Bacon: Fixed Use command-specific alias options when using a group alias.