add long long buffer routines

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

buffer/buffer_puterror.c

@@ -0,0 +1,7 @@
+#include "buffer.h"
+#include <string.h>
+#include <errno.h>
+
+int buffer_puterror(buffer* b) {
+  return buffer_puts(b,strerror(errno));
+}