`smilies_init()`, treat `&nbsp;` like whitespace when converting smilies.

Adds unit tests.

Props miqrogroove.
Fixes #27587.

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In `wptexturize()`, treat `&nbsp;` like whitespace when texturizing hyphens.

Adds unit tests.

Props redsweater, miqrogroove.
Fixes #23185.

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In `wptexturize()`, don't convert C-style hexadecimals to mathematical `×`.

Adds unit tests.

Props harrym, kurtpayne, miqrogroove.
Fixes #19308.

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In `WP_Comment_Query::get_search_sql()`, don't double-like-escape.

Props miqrogroove.
See #10041.

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Fix curly quotes around numbers when applicable.

Adds unit tests.

Props filosofo, mrmist, aliso, MikeHansenMe, miqrogroove.
Fixes #8775.

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git-svn-id: http://core.svn.wordpress.org/trunk@28535 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Set a variable for like-escaped string before looping in `WP_User_Query::get_search_sql()`. 

Props miqrogroove.
Fixes #10041.

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