In the admin, do not use auto-generated Gravatar images for comment authors.

This makes it easier to recognize Gravatars (or lack thereof) when moderating comments.

props solarissmoke.
fixes #7054.


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Multisite: Add a filter to get_space_allowed() and increase its internal default value to the network default.

props jkudish for initial patch.
fixes #23650.


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Format WordPress in <title> tags produced by wp_title().

props evansolomon.
fixes #19211.


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Fix various typos in inline documentation. props nofearinc, fixes #25119.

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Fix typo in phpdoc. props jamescollins. fixes #25092.
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Remove unused variable. props jeremyfelt. fixes #25121.
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Remove redundant context for Child Themes link. fixes #25079.
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