So many things

os.bas has been split into 3 modules. seq.bas has be partitioned from a faulty all purpose sequence module to several specific, array only modules.  shutilE.bas and shutilB.bas are duplicates that raise errors or return false respectively.  I'm awfully too lazy to make a decision on which is better.  Conventionally the error version would be better but with `On Error GoTo` the boolean version sounds appealing.