first pass at merging rpcclient from TNG to HEAD. You can get a

first pass at merging rpcclient from TNG to HEAD.  You can get a
semi-connection and a rpcclient prompt, but no functionality there yet.
Will be a few more days on that.

The changes to the header files were minor.  A few struct's and a few
additional fields to existing ones.  No deletions.  **minimal change
necessary** :-)  Well, maybe not minimal, but I tried.

All other programs compile, link and run ok from what I can tell so
I don;t think I broke anything.

--jerry
(This used to be commit cd7f0b0b91afd3331c0607ba2fcb3ccdd41ecebf)