Ensure proper slashing of the password on install.

This isn't the ideal fix, but it makes things work for now.

props nofearinc.
fixes #26573.

Built from https://develop.svn.wordpress.org/trunk@27736


git-svn-id: http://core.svn.wordpress.org/trunk@27573 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Upgrader skins: Strip tags before displaying error data.

fixes #25394.

Built from https://develop.svn.wordpress.org/trunk@27737


git-svn-id: http://core.svn.wordpress.org/trunk@27574 1a063a9b-81f0-0310-95a4-ce76da25c4cd
WP class: Remove duplication of the post_type query var, also specified as a public QV.

props prettyboymp.
fixes #23862.

Built from https://develop.svn.wordpress.org/trunk@27738


git-svn-id: http://core.svn.wordpress.org/trunk@27575 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-includes/kses.php.

props siobhyb, DrewAPicture.
fixes #25800.

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git-svn-id: http://core.svn.wordpress.org/trunk@27576 1a063a9b-81f0-0310-95a4-ce76da25c4cd