Improve inline documentation for wp-includes/load.php.

Props ericlewis, DrewAPicture.
Fixes #24886.

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Mark the `MYSQL_NEW_LINK` constant as deprecated in 3.9+ as no equivalent to the `$new_link` parameter exists in `mysqli_*` functions.

Fixes #27933.

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Make sure to use 3-digit x.x.x style for two 3.9.0 `@since` versions.

Props netweb.
Fixes #28446.

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Fix SQL generation when `meta_query` has an `'relation' => 'OR'` for its queries and wants to `'orderby' => 'meta_value'`.

Adds unit test.

Props jackreichert.
Fixes #25538.


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Improve inline documentation for the `__construct()` and `add()` methods in `WP_Error` class.

Props jdgrimes.
Fixes #28203.

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Twenty Fourteen: add documentation for global variables used in `twentyfourteen_wp_title()`. Closes #28421.
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Twenty Thirteen: fix layout issue with search form in older versions of Safari and Android. Fixes #24192, props iljoja.
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Twenty Fourteen: apply `.widget` input and textarea styles only if they are inside `.widget-area`. Props jesin, fixes #27677.
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After [28613], also kill queries that explicityly pass empty arrays to `category__in`, `tag__in`, `tag_slug__in`, and `author__in` to `WP_Query`.

Adds unit tests.
Fixes #28099.

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Wrap individual meta query `WHERE` clases in parens, missed in `28659`.

Props boonebgorges.
Fixes #25538.


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Prevent admin breakage for `s` in `WP_Query` after [28623].

See #11330.


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Avoid a PHP notice when using WP_Query::get_queried_object() in pre_get_posts action.

props wpsmith.
fixes #28412.
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Move is_admin check to a more appropriate place.

see #11330.
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Add 'wp_title_parts' filter to wp_title().

props aaroncampbell, obenland.
fixes #17877.
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Add a filter to human_time_diff().

props slimndap.
fixes #27271.
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Avoid an empty href attribute in paginate_links(). Add unit tests.

props obenland, Nessworthy.
fixes #24606.
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wp_insert_comment() and wp_new_comment() should check if the comment was successfully inserted into the database.

props pento.
fixes #28254.
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Remove redundant 'Visit author homepage' title attributes for plugins and themes.

props joedolson.
fixes #26554.
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Force SSL admin when siteurl is explicitly configured with HTTPS.

see #27954.

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Media modal documentation:

Add some clarity to default values for controllers.

Props ericlewis.
See #28459.


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