Add one line for themers ... please

In more complex themes we're working with different placeholders for the node body, as the variable $content or $node->body is manipulated by many modules. I've added a patch that will set the filtered pages as values for more placeholders than only $node->body - as are $node->field_body[0]['value'] and $node->content['body']['#value'].

Perhaps other people use other placeholders in their themes ... it would be nice, to apply the paging to all of them.