Add a general filter to wp_unique_post_slug to allow for full customisation of...

Add a general filter to wp_unique_post_slug to allow for full customisation of the uniqueness functionality. Fixes #14111.


git-svn-id: https://core.svn.wordpress.org/trunk@18546 1a063a9b-81f0-0310-95a4-ce76da25c4cd