Use wp_unslash() instead of stripslashes() and stripslashes_deep(). Use wp_slash() instead of add_magic_quotes().

see #WP21767


git-svn-id: http://core.svn.wordpress.org/trunk@23591 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In ms-functions.php, remove unnecessary slashing, don't strip the return of get_site_option, s/stripslashes*/wp_unslash/.

see #21767


git-svn-id: http://core.svn.wordpress.org/trunk@23592 1a063a9b-81f0-0310-95a4-ce76da25c4cd