[det]debug(+Topic)nodebug(_) removes
all topics. Gives a warning if the topic is not defined unless it is
used from a directive. The latter allows placing debug topics at the
start of a (load-)file without warnings.
For debug/1, Topic can be a term Topic > Out, where Out is either a stream or stream-alias or a filename (atom). This redirects debug information on this topic to the given output.