merge: java.util.Date

[Tom Tromey]

I've merged java.util.Date with libgcj.  By and large I took the
Classpath implementation since it had javadoc comments.  However I
extracted the parse() method from the libgcj implementation.  I know
it is deprecated, but we had a perfectly good implementation sitting
there and there didn't seem to be a reason to abandon it.

Tom