func NewDotter(oType OutputType, gType GraphType, fname string) (*Dotter, error) {
	return NewDotterEx(oType, PROG_DOT, gType, true, true, fname)
}
func NewDotter(oType OutputType, gType GraphType, fname string) (*Dotter, error) {
	return NewDotterEx(oType, PROG_DOT, gType, true, true, fname)
}
// Convenience Wrapper for NewDotterEx(). Makes proper assumptions.
// For more see NewDotterEx().