Merge of sam sync code from TNG.

Reverse-engineered the sam replication protocol from staring at hex dumps
for a while.  It's pretty similar to the sam sync protocol with a couple of
different delta header types.

I wasn't able to figure out the format of the privilege stuff - needs more
time and a whiteboard.  (-:

The impressive bit is that the sam sync stuff from tng basically just
worked thanks mainly to Luke Leighton's efforts in this area.

source/include/rpc_misc.h

@@ -348,5 +348,24 @@ typedef struct uint64_s
 	uint32 high;
 } UINT64_S;
 
+/* BUFHDR2 - another buffer header, with info level */
+typedef struct bufhdr2_info
+{
+	uint32 info_level;
+	uint32 length;		/* uint8 chars */
+	uint32 buffer;
+
+}
+BUFHDR2;
+
+/* BUFFER4 - simple length and buffer */
+typedef struct buffer4_info
+{
+	uint32 buf_len;
+	uint8 buffer[MAX_BUFFERLEN];
+
+}
+BUFFER4;
+
 
 #endif /* _RPC_MISC_H */