BUG:  Check for correct number of required command line args.
BUG:  Check for correct number of required command line args.

dawnsong/ANTs,stnava/ANTs,dawnsong/ANTs,fbudin69500/ANTs,dawnsong/ANTs,fbudin69500/ANTs,stnava/ANTs,dawnsong/ANTs,fbudin69500/ANTs,dawnsong/ANTs,stnava/ANTs,stnava/ANTs,fbudin69500/ANTs,stnava/ANTs,fbudin69500/ANTs,fbudin69500/ANTs,stnava/ANTs,fbudin69500/ANTs,stnava/ANTs,dawnsong/ANTs,dawnsong/ANTs