In batch mode, the message is printed to the standard error stream,
followed by a newline.
+If the variable `inhibit-message' is non-nil, the message is not
+displayed, only logged in the `*Messages*' buffer.
+
The first argument is a format control string, and the rest are data
to be formatted under control of the string. Percent sign (%), grave
accent (\\=`) and apostrophe (\\=') are special in the format; see