row specifications (either as character vectors or the output
from rrow or DataRow, LabelRow,
etc.
format
character(1) or function. The format label (string) or
formatter function to apply to the cell values passed via .... See
list_valid_format_labels for currently supported
format labels.
.lst
list. An already-collected list of arguments to be used instead
of the elements of .... Arguments passed via ... will be
ignored if this is specified.