enlarge receive buffer considerably

the tiny buffer makes no sense in the face of huge payloads and now
additionally masses of replies from pipelined commands.

src/isync.h

@@ -104,7 +104,7 @@ typedef struct {
 	int offset; /* start of filled bytes in buffer */
 	int bytes; /* number of filled bytes in buffer */
 	int scanoff; /* offset to continue scanning for newline at, relative to 'offset' */
-	char buf[1024];
+	char buf[100000];
 } conn_t;
 
 typedef struct {