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Version History:

 1.0 2006-01-04 original

 1.1 2006-01-04 add duplicate elimination

 1.2 2006-01-04 add txt files.

 1.3 2006-01-05 use properties and csv files

 1.4 2006-01-05 check frequency types for validity, check for completeness.

 1.5 2006-03-05 reformat with IntelliJ, add Javadoc.

 1.6 2006-03-05

 1.7 2007-09-26 change default sizes.

 1.8 2009-05-10 add list of excludes, and includes, new header.

 1.9 2010-12-01 improve error messages. schema validation in header.

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