Revert 23416, 23419, 23445 except for wp_reset_vars() changes. We are going a different direction with the slashing cleanup, so resetting to a clean slate. see #21767


git-svn-id: http://core.svn.wordpress.org/trunk@23554 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce wp_slash() and wp_unslash(). This will be used to cleanup the myriad calls to addslashes*, add_magic_quotes, stripslashes*. see #21767


git-svn-id: http://core.svn.wordpress.org/trunk@23555 1a063a9b-81f0-0310-95a4-ce76da25c4cd
There is no need to strip the output of get_site_option().

see #21767


git-svn-id: http://core.svn.wordpress.org/trunk@23556 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: CSS fixes to change single to double quotes, proper quoting around font-family names, and add a missing escape to a background image in custom-header.php. Props markmcwilliams, fixes #23653.

git-svn-id: http://core.svn.wordpress.org/trunk@23557 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Consistently apply 'register' filter. props wonderboymusic for initial patch. fixes #14406.

git-svn-id: http://core.svn.wordpress.org/trunk@23558 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: display caption in galleries. Fixes #23584.

git-svn-id: http://core.svn.wordpress.org/trunk@23559 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Consistently apply 'preview_post_link' filter. fixes #19378.

git-svn-id: http://core.svn.wordpress.org/trunk@23560 1a063a9b-81f0-0310-95a4-ce76da25c4cd