clone_and_merge         Create a local, altered copy of an options
                        manager
defaults                Request default option values
inlist                  Option checkers
is_setting              Find out if we're setting or getting
options_manager         Create a new options manager.
reset                   Reset options to default values
reset_options           Reset general options in 'options' to factory
                        defaults.
reset_par               Reset graphical options in 'par' to factory
                        defaults.
settings                Convenient options settings management for R
stop_if_reserved        Check for reserved option names.
