Changes to add the transcode() method to DOMString, which returns a transcoded

version (to local code page) of the DOM string contents. And I changed all of the
exception 'throw by pointer' to 'throw by value' style.


git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@171436 13f79535-47bb-0310-9956-ffa450edef68