Add a maxlength attribute to the post password input, reflecting the current DB field length.\

props RayBernard, DrewAPicture.
see #24792.


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send_origin_headers() in admin-post.php.

props nickdaugherty, fixes #24600.


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Add a function to return an empty string, for filters. props wpsmith, trepmal. fixes #20357.


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In populate_network(), insert the first site as blog_id 1, overriding any auto-increment DB seed. props wpmuguru, fixes #16568.


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