This function generates all the gpar()
elements for the different text elements within the graph.
Elements not specified inherit their default settings from the
label argument.
List arguments for <code>label</code>/<code>summary</code>
You can provide a list of elements for the label
and summary in order to specify separate elements. If you
provide a list in one dimension the gpar elements are assummed
to follow the columns. If you provide a list of 2 dimensions the
structure assumes is list[[row]][[column]] and the number of elements
should correspond to the number of labels for the label argument, i.e.
without the rows marked as summary elements. The same goes for summary
arguments.