[Weights] First attempt to take into account PageRank when indexing.
[Weights] The new algorithm, indexing with PageRank values, works not so badly.
Merge branch 'trunk' into trunk_w_weights
Merge branch 'trunk' into trunk_w_weights
Merge branch 'trunk' into trunk_w_weights
[Dev] Fixed a small bug where the ScoreBoard structures associated to the document STL map were not synchronised with those of the document STL list.
[Weights] The new algorithm now works properly for cases such as 'paris texas'.
Merge branch 'trunk' into trunk_w_weights
[Data] Integrated the latest updates from ORI (RFD and Geonames).