add long long buffer routines

add tai64 and tai6464 typedefs
add error message buffer routines
add io timeout routines

buffer/buffer_puterror2.c

@@ -0,0 +1,6 @@
+#include "buffer.h"
+#include <string.h>
+
+int buffer_puterror2(buffer* b,int errnum) {
+  return buffer_puts(b,strerror(errnum));
+}