The contents of other files may be included in the configuration file.
If a line is encountered with a less than sign,
column one, then the rest of the line is treated as a file name; the
file name should always be a full file path. The file is opened and its
contents are spliced into the configuration file at that point. Include
files may be nested up to three levels deep.
Any files included in the configuration file must be world readable just as the configuration file is world readable.