writer, with
						each writer representing a table, and the writer.items list containing
						the child data strings and writers.
			call the getAllData method
				call _doneWriting, which removes duplicates
				call _gatherTables. This traverses the tables, adding unique occurences to a flat list of tables
				Traverse the flat list of tables, calling getDataLength on each to update their position
				Traverse the flat list of tables again, calling getData each get the data in the table, now that
				pos's and offset are known.

				If a lookup subtable overflows an offset, we have to start all over.
		NTr.