backend-sql, network hacks

[linas@linas.org]

It's been rumoured that Derek Atkins said:
> 
> Well, I just (finally) got gnucash working again (with much thanks to
> Rob for helping me with getting g-wrap working).  Now that I can
> actually play again, I was planning to integrate the RPC code in and
> see if I could build a client/server.  But I don't know when I'll

OK. To reiterate, look at src/engine/BackendP.h is my idealization of 
wha the api should be.  (its a bit in flux, and undocumented though,
working on it.)

> actually have the time to work on it.  I've got two papers I need to
> write before the end of the month, so I don't have _much_ free hacking
> time.

OK Justthought I'd check base.

--linas