create an interator over a real interval using an imgli2 converter

RealPointIteratorConverter.java

	public static IterableInterval< RealPoint > usingConverters( RealInterval interval, int... numSteps )
	{
		final int nd = interval.numDimensions();
		final double[] steps = stepsFromSamples( interval, fillWithLast( nd, numSteps ) );
		final RandomAccessibleInterval< Localizable > samples = Localizables.randomAccessibleInterval( 
			new FinalInterval( Arrays.stream( steps ).mapToLong( x -> (long)x ).toArray() ));

		RandomAccessibleInterval< RealPoint > positions = Converters.convert2( samples, (x,y) -> {
			for( int i = 0; i < nd; i++ )
				y.setPosition(
						interval.realMin( i ) + steps[ i ] * x.getDoublePosition( i ),
						i );
		}, () -> new RealPoint(nd));

		return Views.flatIterable( positions );
	}