The function returns the Hausdorff distance between two geometries, reflecting how similar the geometries are.

    Changes in this commit:
     - New functor Hausdorff_distance
     - New function hausdorff_distance
     - New class Item_func_st_hausdorff_distance
     - MTR tests for basic functionality
     - unit tests

Change-Id: Ia94c2f8e9ad580fe3103b0d76352971b8c2ff8c9