Inline documentation for hooks in wp-comments-post.php.

props rzen.
see #25229.

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Inline documentation for the welcome_panel hook.

props natejacobs.
see #25229.

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Fixes for hook inline docs in wp-comments-post.php. see #25229.

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Hook docs for admin-footer.php.

props natejacobs.
see #25229.

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Document the trackback_post hook in wp-trackback.php.

props bananastalktome.
see #25229.

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Remove lingering instances of call time pass-by-reference, limited to instances of `callable` - use `$this` instead of `&$this`.

Props jdgrimes.
See #25160.


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When `meta_type` is passed with `orderby => meta_value`, `orderby` must also use `CAST()` to avoid scenarios like: `SELECT`ing by `UNSIGNED` and then ordering by `CHAR`. Adds unit test.

Fixes #21621.

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Remove redundant checks in some update functions. Adds some readability/coding standards cleanup.

Props miqrogroove, azaozz.
Fixes #22828.

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Avoid database error when `include` or `exclude` is not really a `term_id`. Adds more unit tests.

Props kovshenin.
Fixes #11823.


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Avoids incorrect results when `url_to_postid()` checking is not strict enough. Adds a bunch of Unit Tests for `url_to_postid()', which is currently only tested lightly in some XML-RPC tests.

Props gcorne, gradyetc.
Fixes #20560.


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Twenty Fourteen: break long words in comment content (not just anchor text). Fixes #24890, props rickalee.
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Twenty Fourteen: add styling for medialement players, props celloexpressions. See #25209.
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Stop using get_blogaddress_by_domain() when updating the siteurl/homeurl from the network admin.

props jeremyfelt, SergeyBiryukov.
fixes #18242. see #25235.

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