SummaryState.hours: implemented time-based states

    - can configure hour-of-the-clock states as follows

      hours = A-B,C-D,tz

      where A,B,C,D should be integers representing hours, e.g. 2-6 will
      configure hours 2 through 6. The 'tz' is one of

      - 'utc'
      - 'local': local timezone of --ifo
      - IFO prefix e.g. 'H1': local timezone of that IFO