Allow current_time() to accept a date format string, adding to 'timestamp' and 'mysql'.

props danielbachhuber.
fixes #21653.


git-svn-id: https://develop.svn.wordpress.org/trunk@27259 602fd350-edb4-49c9-b593-d223f7449a82
Make the user arguments for get_edit_profile_url() and get_dashboard_url() optional, defaulting to the current user.

props garyc40.
fixes #16686.


git-svn-id: https://develop.svn.wordpress.org/trunk@27260 602fd350-edb4-49c9-b593-d223f7449a82
Remove _relocate_children(), which has had no purpose for some time.

props SergeyBiryukov, scribu.
fixes #19367.


git-svn-id: https://develop.svn.wordpress.org/trunk@27261 602fd350-edb4-49c9-b593-d223f7449a82