The following functions to access/set the options from
the set are assigned in envir:
<subset>Options
<subset>GetOption
Usage
setupPackageOptions(..., NAME = NULL,
ENVIR = topenv(parent.frame()),
RESET = isLoadingNamespace())
Arguments
...
a single named list or named arguments that
provide the default options and their values.
NAME
name of the set of options. This is used as a
prefix for the name of the associated global option:
package:<name>.
ENVIR
environment where the option wrapper
functions will be defined. No function is defined if
ENVIR=NULL
RESET
a logical that indicates whether the option
set should overwrite one that already exists if
necessary. The default is FALSE (i.e. no reset),
except when loading a namespace, either from an installed
package or a development package – with devtools. If
FALSE, an error is thrown if trying to setup
options with the same name.
providing 
.