Improvement

• #68: Improve implementations of Seq interfaces. Note: The changes of this issue changes the Java serialization of the Genes and Chromosomes. Gene/Chromosomes which has been serialized with version 3.3 can't be loaded with version 3.4. As a workaround, it is still possible to write the Genes/Chromosomes in XML format and load it with version 3.4.
• #73: Add additional methods to Seq interface: Seq.append and Seq.prepend.
• #79: Improve evolution performance measuring. Code resides now in (experimental) org.jenetics.tool module.
• #85: Add support for fixed-sized subsets in PermutationChromosome class. See also codecs.ofSubSet(ISeq, int).