Get the names of arguments in usage sections of Rd objects.

## Usage

Rdo_get_argument_names(rdo)

rdo

an Rdo object.

## Details

All arguments names in the "arguments" section of rdo are extracted. If there is no such section, the results is a character vector of length zero.

Arguments which have different descriptions for different OS'es are included and not duplicated.

Arguments which have descriptions for a particular OS are included, irrespectively of the OS of the running R process. (todo: introduce argument to control this?)

## Value

a character vector

## Author

Georgi N. Boshnakov

Rdo_get_item_labels
##---- Should be DIRECTLY executable !! ----