countme-totals: WIP, but CSV output works
    
    countme-totals.py now emits the data you'd expect: CSV with per-week
    totals, split out by:
    
      (os_name, os_version, os_variant, os_arch, countme, repo_tag, repo_arch)
    
    This will need cleanups (look at all those TODO/FIXMEs!) but I wanted to
    push _something_ that worked so I could try some test-runs against real
    data.
    
    Known bugs/deficiencies include:
    
    * ignores --format and --output, only does CSV to stdout
    * CSV headers missing
    * --progress unimplemented
    * --sqlite ignored
    
    I'll get to all that ASAP, but we gotta start somewher!