Removes all overrides for a specific variable (or all variables), resetting them to auto-detected defaults.
config.reset(var_name = NULL, options_file_name = NULL, options_dir = NULL)[list] The updated fully-resolved data config (invisibly).
[character, optional] The variable name to reset. If
NULL (default), resets all overrides.
[character, optional] The name of the options
file. If NULL (default), the user will be prompted interactively.
[character, optional] The directory containing options
files. If NULL (default), the default directory is used.