added code to concat so that it will not try to redo same sql file if not deleting them then resuming.
Merge branch 'master' of github.com:Burke-Lauenroth-Lab/SoilWat_R_Wrapper
added some export variables.
Merge branch 'master' of github.com:Burke-Lauenroth-Lab/SoilWat_R_Wrapper