Upgrade Symfony to v1.4.20
Avoid caching less files in Trillium
Fix some issues showing siblings in the treeview
Fix a problem in the ACL drafts filter
Upgrade viewDraft check to use slugs, fixes #3306
Add missing semicolon
Filter drafts in the imageflow, fixes #3887
Remove .htaccess support from installer

Refs #3092.

Conflicts:
	plugins/sfInstallPlugin/modules/sfInstallPlugin/actions/checkHtaccessAction.class.php