static public WorkSheet unionWorkSheetsRowJoin(String w1FileName, String w2FileName, char delimitter, boolean secondSheetMetaData) throws Exception {
		WorkSheet w1 = WorkSheet.readCSV(w1FileName, delimitter);
		WorkSheet w2 = WorkSheet.readCSV(w2FileName, delimitter);
		return unionWorkSheetsRowJoin(w1, w2, secondSheetMetaData);

	}
static public WorkSheet unionWorkSheetsRowJoin ( String w1FileName , String w2FileName , char delimitter , boolean secondSheetMetaData ) throws Exception { WorkSheet w1 = WorkSheet . readCSV ( w1FileName , delimitter ) ; WorkSheet w2 = WorkSheet . readCSV ( w2FileName , delimitter ) ; return unionWorkSheetsRowJoin ( w1 , w2 , secondSheetMetaData ) ; }
Combine two work sheets where you join based on rows. Rows that are found
in one but not the other are removed. If the second sheet is meta data
then a meta data column will be added between the two joined columns

@param w1FileName
@param w2FileName
@param delimitter
@param secondSheetMetaData
@return
@throws Exception