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.


git-svn-id: https://develop.svn.wordpress.org/trunk@27736 602fd350-edb4-49c9-b593-d223f7449a82
Upgrader skins: Strip tags before displaying error data.

fixes #25394.


git-svn-id: https://develop.svn.wordpress.org/trunk@27737 602fd350-edb4-49c9-b593-d223f7449a82