Fix a number of whitespace issues in various parts of the code, add validation to most calls on the test and take a first stab at implementing the reconnection pipe blocking.

It didn't seem straightforward to use any of the existing process calls, so I have added a new command to command_t and friends called detach. This instructs the socket_base to remove the pipe from it's pipe list. The session base stores a copy of the outpipe, and will resend the bind command on reconnection. This should allow balancing again.

src/session_base.hpp

@@ -52,9 +52,6 @@ namespace zmq
 
         //  To be used once only, when creating the session.
         void attach_pipe (zmq::pipe_t *pipe_);
-        
-        // To be used once only, for delayed connection
-        void onconnect_attach_pipe (pipe_t *pipe_);
 
         //  Following functions are the interface exposed towards the engine.
         virtual int read (msg_t *msg_);
@@ -106,7 +103,10 @@ namespace zmq
 
         //  Pipe connecting the session to its socket.
         zmq::pipe_t *pipe;
-        
+
+        //  Socket end of pipe, in case of reconnection
+        zmq::pipe_t *outpipe; 
+
         //  This flag is true if the remainder of the message being processed
         //  is still in the in pipe.
         bool incomplete_in;