optparse.OptionParser:
Class attributes:
standard_option_list : [Option]
list of standard options that will be accepted by all instances
of this parser class (intended to be overridden by subclasses).
moap.extern.command.command.CommandOptionParser:
I parse options as usual, but I explicitly allow setting stdout so
that our print_help() method (invoked by default with -h/--help)
defaults to writing there.