Correct cascade issues and remove some unused CSS for the admin menu. see #18380.

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git-svn-id: http://core.svn.wordpress.org/trunk@27666 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Restore the original z-index of the sticky admin menu, as first set in [26442].

The inline comment is now correct again. This z-index was changed in [26701], but those circumstances no longer apply after [27532].

props mordauk.
see #26442, #26952.
fixes #26567.

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git-svn-id: http://core.svn.wordpress.org/trunk@27667 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use correct column name. See [27152].

props barry.
fixes #25545.

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git-svn-id: http://core.svn.wordpress.org/trunk@27668 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Rewrite: Use same delimiter in url_to_postid() we use in WP::parse_request().

props stevenkword.
fixes #23587. 

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git-svn-id: http://core.svn.wordpress.org/trunk@27669 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revert the conversion of adjacent post queries to WP_Query. Explanation on the ticket.

Reverts [27285], [27286], [27287], [27288], [27291], [27292], [27293], [27296], [27633], [27634], [27635], and [27692].

see #26937.

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git-svn-id: http://core.svn.wordpress.org/trunk@27670 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid infinite recursion in get_term_children() when a term is incorrectly a parent of itself.

props kovshenin.
fixes #27123.

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git-svn-id: http://core.svn.wordpress.org/trunk@27671 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add a value to the password checkbox when creating a new user so the toggle is remembered.

props chriseverson, SergeyBiryukov.
fixes #27006.

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git-svn-id: http://core.svn.wordpress.org/trunk@27672 1a063a9b-81f0-0310-95a4-ce76da25c4cd