When the MySQL server has "gone away," attempt to reconnect and retry the query.

props pento.
see #5932.

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Remove an unnecessary variable passed to wpdb::prepare() during multisite load.

props jeremyfelt.
fixes #26941.

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git-svn-id: http://core.svn.wordpress.org/trunk@26949 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Consistently trim and unslash search queries for the users list tables.

props aubreypwd.
fixes #26115.

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git-svn-id: http://core.svn.wordpress.org/trunk@26950 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editor: add :focus style for the Quicktags buttons, fixes #26932
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git-svn-id: http://core.svn.wordpress.org/trunk@26951 1a063a9b-81f0-0310-95a4-ce76da25c4cd