Add program used to generate change tables
    
    Added build/checkBeat12XML.c which reads a list of packages
    and checks two repo databases for differences in those packages.
    The result is output as an XML table.  This is the program that
    generates the "All Changes" tables for the release notes.  Requires
    -lsqlite3 to link.  Requires that two primary.sqlite files be
    downloaded from the two repos of interest.