add long long buffer routines

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

buffer/buffer_puterror2.3

@@ -0,0 +1,13 @@
+.TH buffer_puterror2 3
+.SH NAME
+buffer_puterror2 \- write error string to buffer and flush
+.SH SYNTAX
+.B #include <buffer.h>
+
+int \fBbuffer_puterror2\fP(buffer* \fIb\fR,int \fIerrnum\fR);
+.SH DESCRIPTION
+buffer_puterror2 writes the error message corresponding to the error
+number in \fIerrnum\fR to the buffer (e.g. "No such file or directory"
+for ENOENT).
+.SH "SEE ALSO"
+buffer_puterror(3), buffer_puts(3), buffer_put(3), buffer_flush(3), buffer(3)