public static PermutationChromosome<Integer> ofInteger(final int length) {
		return ofInteger(0, Requires.positive(length));
	}
Create a integer permutation chromosome with the given length.

@param length the chromosome length.
@return a integer permutation chromosome with the given length.
@throws IllegalArgumentException if {@code length <= 0}.
jenetics/src/main/java/io/jenetics/PermutationChromosome.java