Generic accessors for any option in the energyRt registry. See
?energyRt-options for the full list, or en_config_show() to print every
option together with the source its current value came from.
Each option can be set three ways, in decreasing priority: the R option
(options(en.<name> = )), the environment variable
(ENERGYRT_<NAME>), or the configuration file (see en_config_write()).
