WordPress Upgrades: When defining the default filesystem permissions for files/directories, base the value on the existing ABSPATH & index.php file permissions - so as to respect the executable bit (if set) and not set global read if not required.
This sets a minimum permission set to 750 and 640 for directories and files, so any systems requring less permission than that will still need to define the constants themselves. Fixes #20069 

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Inline documentation for hooks in wp-admin/user-new.php.

props bftrick.
see #25229.
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Expect a possible array of post types in get_body_class(). props norcross. fixes #25341.
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