* removing one constructor from JoinQO that had the same number of arguments as other constructor that was used more often

 * randompivotchooser marked as deprecated, because it does not select the pivots uniformly; it took me about 8 hours of my time

 * LocatorQueryOperation now allows more than one query locator
 * RefineCandidate operation generalized to be applicable also to multi-query operations
 * KNN RankByLocator allows more than one query locator
 * added new multi-query average distances (geometric mean and harmonic mean)

 * adding new options in aggregation function

* Added a few tests for the sorting iterator

* Updated sorted iterator to incorporate original intersection computation (this will be removed in the future)
* Added implementations of Cosine and Jaccard distance functions for text processing

 * WARNING: this cosine distance is not metric

 * convinience methods for parameter handling in AbstractOperation
 * bug fixes

 * created new operation to re-rank given list of IDs with respect to query object and return the top-k
 * created a common abstract ancestor for all operations that have a query object specified by locator
 * RefineCandOperation moved to package .query

 * added an Extractor that wraps existing extractor with putting the created object to MetaObject