Introduce post_password_expires filter to control the expiration of the post password cookie.

props Viper007Bond for initial patch.
fixes #21466.

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Always pass integer expirations to cache backends.

props SergeyBiryukov, andreasnrb.
fixes #25308.

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Use get_terms() in the ajax tag search.

props Chouby.
fixes #25231.

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Let the wp_redirect to media-new.php from post-new.php?post_type=attachment be canceled using the wp_redirect filter.

props DrewAPicture.
fixes #25216.

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Allow callback args to be passed from wp_add_dashboard_widget() to add_meta_box().

props jdgrimes.
fixes #25152.

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Inline documentation for hooks in wp-includes/load.php.

props mordauk.
see #25229.
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