Kill the query in the following edge case: `post_type => 'any'` but `exclude_from_search => false` returns no valid post types. Adds unit tests.

Props mitchoyoshitaka.
Fixes #19198.


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git-svn-id: http://core.svn.wordpress.org/trunk@25209 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unnecessary checks before setting `$wp_settings_*` arrays. Adds unit test for setting a nonexistent variable to a multi-dimensional `array`.

Props scribu.
Fixes #17884.


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git-svn-id: http://core.svn.wordpress.org/trunk@25210 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce `description__like` arg to `get_terms()`. Make `description__like` and `name__like` perform `LIKE`s with a wildcard on both sides of passed string. Previously, strings had to match the beginning of the name, so searching for `burrito` in `This is a burrito` would fail. Adds unit tests.

Props aaroncampbell for the original patch, 5 years ago.
Fixes #8214.


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git-svn-id: http://core.svn.wordpress.org/trunk@25211 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Allow `get_pages()` to accept an `array` for the arg `parent`. Adds unit tests, some will fail until the next commit.

Fixes #9470.


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git-svn-id: http://core.svn.wordpress.org/trunk@25212 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Set `hierarchical` to `false` when `parent` is passed to `get_pages()` and `child_of` is not.

Fixes #25230.


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git-svn-id: http://core.svn.wordpress.org/trunk@25213 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Ensure zxcvbn.min.js loads when we are guessing the wp-includes URL.

props iandunn, SergeyBiryukov.
fixes #25201.

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git-svn-id: http://core.svn.wordpress.org/trunk@25214 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce `author__in` and `author__not_in` query vars. Fixes issue with multiple author exclusion when comma-separated string is passed for `author`. Adds a bunch of missing unit tests.

Props pollett for initial patch.
Fixes #16854.


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git-svn-id: http://core.svn.wordpress.org/trunk@25216 1a063a9b-81f0-0310-95a4-ce76da25c4cd