Prep for 6.4.0
Back to dev.
Fix typo at topics docs-cron
Move the major version check to root_validate function so that the unsupproted message shows correct info and stops further processing.
Per #801, comment out a Make test until a better host is found, or test gets a Mock.
Support DB prefix in sql sanitize
TRUE boolean.
Upgrade update_info to a first class engine.
Honour 'add-options-to-command' for engine type options.
Fix management of engine load failure.

Also improve docs and improve readability.
Remove leftover function that we stop using in 2010!.

Refer to commit 8d8433

Conflicts:
	commands/pm/update_info/drupal_7.inc
Fix reference in topic_drush_help_alter() param
Add missing @param at drush_set_error()

$output_label argument is not defined in the docblock.
Fix #801. Reenable testMakeSubtree with new url.
Fix doxygen: @file must be followed by a filename or nothing. Summary string below.

Conflicts:
	commands/xh.drush.inc
	includes/preflight.inc
More doxygen: fix undocummented files and functions related to pm.

Conflicts:
	commands/pm/update_info/drupal_7.inc
	tests/releaseInfoTest.php
Complete pm_update_filter() docs with all possible update status.

Conflicts:
	commands/pm/update_info/drupal_7.inc
Fix typo.

Conflicts:
	commands/pm/update_info/drupal_7.inc
Fix typo.
Allow contrib_destination to be managed per project.