Business Interface support

[David Blevins]

So basic support is now in for the IntraVM server (OPENEJB-92,  
OPENEJB-93).  For the individual containers, I ended up creating a  
standard BusinessLocalHome interface and BusinessRemoteHome  
interface.  These serve to sort of adapt the business interface  
concept into the existing code.   That seemed to be the path of least  
resistance.

So now there are two new JNDI Reference types.  When getObject is  
called on them they simply call BusinessLocalHome.create() and return  
the business object proxy.  I'd put the business interface proxies  
themselves right into JNDI to start with -- which we could  
potentially do for stateless -- but for stateful the act of looking  
it up creates the proxy.  The thing that would stop us from putting  
the stateless proxies in JNDI to start with is that the current mode  
of operation is that we will invalidate the proxy if a system  
exception is thrown (either by the bean, the server, or the client  
itself).

Not sure how all this is going to play out in the remote protocol  
(OPENEJB-91).  We'll see.  Off to work on that next.

-David