Addition of Ladderize program

Creation of folder structure for Java; addition of Ladderize and Taxon,
both source and compiled version; addition of ladderize_readme.txt
Taxon update

Added generic class for Comparable interface.
Addition of Linearize program and readme updates

Addition of compiled Linearize.class and source Linearize.java; update
of ladderize_readme.txt; addition of linearize_readme.txt.