countme: sqlite updates, final CSV dump output
    
    countme-totals-sqlite.py now has much nicer progress reporting and
    writes CSV output in a more human-readable format, hooray.
    
    Also rejiggered some of the SQLiteReader/Writer stuff to make the way we
    figure out the start/end dates in a database easier, which makes
    figuring out which weeks need updating a little easier to read. I think.