Lightweight peer implementation

[Scott Gilbertson]

From: "Thomas Fitzsimmons"
> OK, here is another patch that builds on Scott's.  I've left the
> Component null checks alone for now.  The patch moves GLightweightPeer
> to gnu.java.awt.peer and implements some of the missing ComponentPeer
> methods.
>
> Comments?

Looks about right to me, except that the patch includes a comment insertion
in java.awt.Component, which I don't think was necessary and is not
mentioned in the change log.  Also, I guess Makefile.in needs to be included
as "re-generated".  In the JRE, the parameter to Toolkit.createComponent is
called "target", but I don't know if it's important for us to match that.