Updates to UniqueUnion to operate on 'source' files, produce final list.

I've updated the UniqueUnion program.  It runs from the 'bin' directory, finds the 'source' files, converts them to A-labels, and then merges into a single unique records file.

Some data files were renamed so that a history can optionally be stored.

All updates are in the UniqueUnion jar/source or the data/final directories.  Did not touch the 'source' files in the root.