Changes since 1.6.11:

    Version 1.7.1 (23 December 2011)
        fixes in CUDA kd-tree index
        renamed some constants to avoid conflicts with other libraries

    Version 1.7.0 (20 December 2011)
        new index type (HierarchicalClusteringIndex) for matching features
        using any metric distance (works well for binary features and Hamming
        distances)
        LSH implementation for matching binary features contributed by Vincent
        Rabaud
        GPU kd-tree matching for 3D features on CUDA compatible hardware
        contributed by Andreas Muyzel
        support for multithreaded search using the TBB library contributed by
        Nick Vanbaelen
        better performance when searching for many neighbors
        improvements to the MPI search support
        support for radius search using multiple query points at once
        small breaking API change if upgrading from a previous version, check
        the manual on how to update your code.
        bug fixes