[poe] new commits pushed by vroddon

The following commits were just pushed by vroddon to 
https://github.com/w3c/poe:

* Restored deleted properties (like constraint, operator etc.) as 
deprecated ones.
Listed in the collection of deprecated terms.
Changed two additional references to :duty and :action by :hasDuty and
 :hasAction
  by Víctor Rodríguez Doncel
https://github.com/w3c/poe/commit/8c8bd606eea4f766849b306580e992345e3f1415