Re-order functions for more logical documentation

src/include/tftpcore.h

 
 #include "tftp.h"
 
-extern int tftp_get ( struct tftp_state *state, long timeout,
-		      union tftp_any **reply );
-
 extern int tftp_open ( struct tftp_state *state, const char *filename,
 		       union tftp_any **reply );
 
 
 extern int tftp_ack_nowait ( struct tftp_state *state );
 
+extern int tftp_get ( struct tftp_state *state, long timeout,
+		      union tftp_any **reply );
+
 extern int tftp_ack ( struct tftp_state *state, union tftp_any **reply );
 
 extern int tftp_error ( struct tftp_state *state, int errcode,