Add ANTLR-generated files to CVS

ANTLR is used to convert the java.g and java.tree.g files in drools-java/src/main/org/drools/semantics/java/parser/ into a set of Java files with the package org.drools.semantics.java.parser.

Users trying to compile Drools without Maven (which automatically runs ANTLR) are often confused by the missing ANTLR-generated Java files, and this is frequently a source of questions from users.

Since the *.g files have not changed since Sept. 2002, it should be safe to check the generated Java files into CVS so they are available to all users without the need for them to explicitly run ANTLR first.