Merge pull request #1012 from hurtonm/master

Update mechanism API so we can check for ERROR status
Consolidate VS props to shared location.
Rename VS version resource file.
Integrate GSSAPI option in VS UI options and props.
Update VS 2008/10/12/13 file distribution.
Merge pull request #1014 from evoskuil/master

Integrate GSSAPI option in VS UI options and props.
NULL: Implement ERROR handling

NULL mechanism sends ERROR command rather than READY command when ZAP
handler rejects the ZAP request (status code != "200"). The body of
ERROR command contains the status code as returned by ZAP handler.