wrapList: Wrapping of arguments in a list
Description
Wraps the specified argument in a list.Value
list which wraps the provided argument if it not already was a list.
If the provided argument is a S4 class with a 'jobj' slot, the corresponding slot is extracted and
wrapped in a list.
Details
Wraps an argument in a list if it not already is a list.
Further extracts the 'jobj' slot from S4 classes (such as workbook
and cellstyle).