Add nut-data model
Add src-cd model
Add deriv-cd model
Add nutr-def model
Correct spelling mistake in deriv-cd
Add NUT_DATA to mappings file
Add NUTR_DEF to mappings file
Add SRC_CD to mappings file
Add DERIV_CD to mappings file
Change empty Strings to null in split-stream
Add SRC_CD, DERIV_CD, NUTR_DEF, and NUT_DATA to parsed files in creator