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

0 files changed, 0 insertions, 0 deletions