Britta Weber 74927adced significant terms: infrastructure for changing easily the significance heuristic
This commit adds the infrastructure to allow pluging in different
measures for computing the significance of a term.
Significance measures can be provided externally by overriding

- SignificanceHeuristic
- SignificanceHeuristicBuilder
- SignificanceHeuristicParser

closes #6561
2014-07-14 11:00:50 +02:00
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