Build manual page from Python 3 ArgumentParser object
Description
Generate manual page an automatic way from ArgumentParser object, so the
manpage 1:1 corresponds to the automatically generated --help output. The
manpage generator needs to known the location of the object, user can
specify that by (a) the module name or corresponding python filename and
(b) the object name or the function name which returns the object.
There is a limited support for (deprecated) optparse objects, too.
