options_zero: Set Options to Initial Zero State
Description
This makes sure to unset options not present in target.
Usage
options_zero(
  base = merge_lists(getOption("unitizer.opts.init.base"),
    getOption("unitizer.opts.init")),
  as.is = union(getOption("unitizer.opts.asis.base"), getOption("unitizer.opts.asis"))
)options_update(tar.opts)
validate_options(opts.to.validate, test.files = NULL)