refactor _get_request_xml_nodes to (again) use double pointers to nodes; parser function optimizations
refactor _get_request_xml_nodes to (again) use double pointers to nodes; parser function optimizations

SpectraLogic/ds3_c_sdk,TigerTechnology/ds3_c_sdk,chanchett/ds3_c_sdk,robertgrimm/ds3_c_sdk,robertgrimm/ds3_c_sdk,shabtaisharon/ds3_c_sdk,shabtaisharon/ds3_c_sdk,robertgrimm/ds3_c_sdk,SpectraLogic/ds3_c_sdk,SpectraLogic/ds3_c_sdk,TigerTechnology/ds3_c_sdk,DenverM80/ds3_c_sdk,DenverM80/ds3_c_sdk,chanchett/ds3_c_sdk,DenverM80/ds3_c_sdk,TigerTechnology/ds3_c_sdk,DenverM80/ds3_c_sdk,SpectraLogic/ds3_c_sdk,TigerTechnology/ds3_c_sdk,chanchett/ds3_c_sdk,robertgrimm/ds3_c_sdk,shabtaisharon/ds3_c_sdk