Upgrader: Perform a MD5 file verification check on the files during upgrade. This ensures that both a Partial upgrade build can be used, and that all the files were copied into place correctly.
Props pento for initial patch. Fixes #18201

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When using download_url(), if the resource supplies a Content-MD5 header, verify the downloaded file against it. Fixes #20074

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WordPress Core Automatic Updates: Add a filter as to whether or not to send the site administrator a summary of executed updates. Props JustinSainton. See #22704

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Add a missing . in the Hook documentation from r25542 See #22704

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Plugin Update API: Set the translations key to an empty array when the API is unavailable. Props rmmcue. See #18200

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Update imgAreaSelect to 0.9.10. fixes #25370.
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Trim leading whitespace from AJAX responses.

This fixes the warning "$(html) HTML strings must start with '<' character" by jQuery Migrate when adding nav menu items, post custom fields or comment replies.

fixes #23681.
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Image Edit: Replace deprecated $.load() and $.error() methods to prevent warnings by jQuery Migrate, fixes #25371.
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Update imgAreaSelect version in script-loader.php for [25545], see #25370.
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Update Jcrop to 0.9.12 (unused in WP core).

fixes #25342.
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