Changes in version: grouped_0.3-0

  o coef method corrected.

  o correct typos and update Rd files.

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Changes in version: grouped_0.2-0

  o format.char() changed to format() in print.power.grouped().

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Changes in version: grouped_0.1-1

  o corrected some typos in manual files.
  o corrected some typos in warning messages.
