Datetimepicker widget:
  - introduced the 'iso8601' data format (used by default)
  - rejigged the format processor to use our 'getISO8601' monkeypatched Date
    routine
  - minor changes to tz database... remove dupes, renamed Australia/Eucla to
    Australia/Perth
Datetimepicker widget display fixes:
  - replace '_' with ' ' for tz label
  - report UTC offset as HH:MM
  - nice label for DST timezones
vocab widget: fixed a bug with selecting in narrow mode on text box (with autocomplete)