Fixing the holes in Sun's APIs

I've spent another week fixing a lacuna in one of Sun's APIs - in this case, the fact that JDBC lacks a database neutral means of manipulating user accounts.

Unlike MaybeUpload and the Servlet API, JDBCUserKluge is not even nearly seamless to use for users of JDBC API. It's written very much as an integral part of Jacquard. It's something I've known I had to do for - literally - years, and which I've been putting off because I knew it would be hard. And now I've done it.