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implement reading of ISO 8601 durations

nmartensen requested to merge topic/3.0/iso_delta_reading into branch/3.0

This implements reading the limited subset of the ISO 8601 duration specification that seems to be used by Excel when writing in OOXML strict mode:

  • Only hours, minutes, and seconds are understood
  • Only the point is accepted as decimal separator
  • The duration string always starts with 'PT'
  • No negative values allowed

--HG-- branch : 3.0

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