Avoid PHP notices in Media Library if an attachment parent does not exist. props trepmal, viniciusmassuchetto, alex-ye, adamsilverstein for initial patches. fixes #22312. fixes #23154.

git-svn-id: http://core.svn.wordpress.org/trunk@24182 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Clarify the instructions on Edit Menus screen. props tw2113. fixes #23936.

git-svn-id: http://core.svn.wordpress.org/trunk@24183 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update some copy in the Post Formats UI.

see #24227


git-svn-id: http://core.svn.wordpress.org/trunk@24184 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update the instructions on Edit Menus screen. props DrewAPicture. fixes #24261.

git-svn-id: http://core.svn.wordpress.org/trunk@24185 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove the body of the deprecated links_popup_script() as currently it issues a fatal error. see #24210.



git-svn-id: http://core.svn.wordpress.org/trunk@24186 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove manual printing of userSettings as utils.js receives this as inline script data (since 3.5). see #24210.



git-svn-id: http://core.svn.wordpress.org/trunk@24187 1a063a9b-81f0-0310-95a4-ce76da25c4cd
remove_filter() only accepts three arguments: filter, callback, and priority. An accepted args parameter is only used for adds.

props rlerdorf.
see #24210.



git-svn-id: http://core.svn.wordpress.org/trunk@24188 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix usage of undeclared variables.
 * the_weekday_date() needs the global $currentday
 * ms_site_check() needs the global $current_site
 * media list table does not need to check for $total_orphans
 * upgrader has no $feedback variable, appears to be copypasta from other upgrade APIs
 * install_themes_feature_list() has no $features variable, return array() instead of a new return type of WP_Error

see #24210.



git-svn-id: http://core.svn.wordpress.org/trunk@24189 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use correct variable in atomlib library, inside an error message. props rlerdorf, see #24110.


git-svn-id: http://core.svn.wordpress.org/trunk@24190 1a063a9b-81f0-0310-95a4-ce76da25c4cd