Order search results by relevance, rather than by date.

The ordering logic is as follows:
 * Full sentence matches in post titles.
 * All search terms in post titles.
 * Any search terms in post titles.
 * Full sentence matches in post content.

Each section and any remaining posts are then sorted by date.

Introduces some filters:
 * wp_search_stopwords, to filter stop words ignored in WHERE.
 * posts_search_orderby, to filter the ORDER BY when ordering search results.

props azaozz, wonderboymusic.
fixes #7394.

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Changes to automatic background updates in preparation for Beta 1.

 * Show a notice for beta testers on update-core.php explaining the status of their install. Three possibilities: auto updates are enabled, auto updates are disabled because the install doesn't support SSL HTTP requests, and auto updates are disabled because it is a VCS checkout.
 * Improve the output of the email, for maximum debugging potential. Failures are clearly labeled and the email leads testers to the support forums and Trac.
 * Try to create wp-content/languages in the upgrader if it doesn't exist. Our mkdir isn't recursive, so trying to create wp-content/languages/plugins could fail.
 * Abstract out version control checkout determination into a public method. The filter is now auto_upgrade_is_vcs_checkout, still subject to change.

see #22704.

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Filters for locale in wp_update_plugins() and wp_update_themes(). see #18200.

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Fix strict notice. see #22704.

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Fix non-square rotations when using the Imagick image editor.

props DH-Shredder.
fixes #22663.

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Expand the zxcvbn password meter blacklist, based on user input.

props iandunn.
see #25174.

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3.7-beta1

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3.7-beta1-25639

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Mark _search_terms_tidy() as deprecated in 3.7. see #7394.

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Inline documentation improvements for `Walker_Category` and `Walker_CategoryDropdown`.

Also covers previously undocumented parameters.

See #23406, #19249.

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Inline documentation for `Walker_Category_Checklist`.

See #23406.

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Improve inline documentation for `Walker_Nav_Menu`, `Walker_Nav_Menu_Edit`, `Walker_Nav_Menu_Checklist`.

Includes previously undocumented parameters.

See #23406.

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Improve inline documentation for the `Walker` class.

Includes previously undocumented parameters.

See #23406.

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Inline documentation for hooks in wp-signup.php.

Props kpdesign, miyauchi.

Fixes #25381.

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Correct phpdoc for translate_smiley(). props toscho. fixes #25440.
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Automatic Updates: Skip doing the sanity checking MD5 before deciding if we should use a partial build or not, This change means we always use a partial build for automatic updates. See #22704

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MD5 file verification: Prevent md5_file() warnings when files don't exist, additionally, don't verify wp-content files as they can be updated separately, as well as WP_CONTENT_DIR being set elsewhere. See #22704 See #18201

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Automatic Updates: Add a rollback functionality upon installation failure, the rollback package will be available for partial-updates for automatic updates and be similar to our existing partial builds (but in reverse).
A further iteration of this is to also detect whitescreens (fatals) after a auto update, and trigger the rollback for that too.
See #22704

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Automatic Updates: Disable Automatic updates for Mercurial(HG) and Bazaar(bzr) version control systems in addition to Git and SVN. Props jamescollins. See #22704

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Automatic Updates: Remove some debug from [25649] See #22704

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