Don't return false from search_theme_directories() when a single directory is not readable.

Issue a notice.

props csixty4.
fixes #24639.



git-svn-id: https://core.svn.wordpress.org/trunk@24976 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Pass $update = true to the save_post and wp_insert_post hooks in wp_publish_post().

see #21450, [24823].

props wpsmith.
fixes #24957.


git-svn-id: https://core.svn.wordpress.org/trunk@24977 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove reference to unused global. props jdgrimes. fixes #24807.



git-svn-id: https://core.svn.wordpress.org/trunk@24978 1a063a9b-81f0-0310-95a4-ce76da25c4cd