Fix invalid markup when searching for installed themes. fixes #25288.
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Consistently call skin methods in WP_Upgrader. fixes #25254.
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Indicate that the fall-through in `is_serialized()` is deliberate. fixes #24023.

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Inline documentation for hooks in wp-admin/options.php.

props siobhyb.
see #25229.
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Use `reset()` to access the first element of an array, don't assume there is an item at index `0`.

See #25282.


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When the WordPress files are in a subdirectory, correctly redirect the user to the setup-config.php page from the parent directories index.php. Fixes #24480

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Add sanity checks to `get_*_template()` functions to ensure that the return value of `get_queried_object()` is compatible with the assumed context.

Fixes #25291.
See #25282.


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* Add `isset()` checks all over `WP_User_Query::prepare_query()` and `WP_User_Query::query()`. When a `WP_User_Query` instance is constructed without passing args, no query vars are filled in, thus `$qv` doesn't contain most of the expected indices.
* Suppress an undefined index notice in `tests/user/query.php`

Fixes #25292.
See #25282.


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git-svn-id: http://core.svn.wordpress.org/trunk@25326 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix wp_guess_url() to work in every scenario I could find, allows us to use it to determine the correct path to the WordPress Site URL before installation for install.php and setup-config.php redirects. Fixes #24480 Fixes #16884

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