array: renaming diff to subtract
array: renaming diff to subtract

berryma4/diirt,berryma4/diirt,ControlSystemStudio/diirt,berryma4/diirt,diirt/diirt,diirt/diirt,ControlSystemStudio/diirt,ControlSystemStudio/diirt,diirt/diirt,diirt/diirt,berryma4/diirt,ControlSystemStudio/diirt,richardfearn/diirt,richardfearn/diirt,richardfearn/diirt