include_file(name, indent, encoding)
Instance Public methods
Handles the :include: filename directive.
If the first line of the included file starts with '#', and
contains an encoding information in the form 'coding:' or
'coding=', it is removed.
If all lines in the included file start with a '#', this leading
'#' is removed before inclusion. The included content is indented
like the :include: directive.