HPCC-11819 Code review changes
-esdl2xml tranform() remove use of extraneous flag
-remove commented out code
-Do not output includes if not writing to file
-Utilize multiple appends vs appendf per Fishbeck
-Remove legacy write_xml() methods
-XML attributes now within single quotes


Signed-off-by: rpastrana <rodrigo.pastrana@lexisnexis.com>