reger 3c7220bc7b Refacture rwi reference word position and word distance calculation
used for rwi ranking.
Main changes:  
- introduce a  posintext() to access the stored value. This reduces also mem alloc of position array for WordReferenceRow (index access)
- use the positions() array for joined references on multi-word queries if needed (otherwise allow positions() to be null
- adjust assignments and the min() max() and distance() calculation accordingly
2016-10-23 19:40:02 +02:00
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