moved subtract() to more logical location in file structure
moved subtract() to more logical location in file structure

jstat/jstat,smarden1/jstat,akrawitz/jstat,JeebsM/jstat,jamescgibson/jstat,cmpolis/jstat,NorthDecoder/jstat,jstat/jstat,ggonzale/jstat,smarden1/jstat,ggonzale/jstat,NorthDecoder/jstat,akrawitz/jstat,JeebsM/jstat