Fix a typo in the existing copyright notices and add notices for the files in the tests/ directory.
Stop using Boost for unordered_set, unordered_map and hashes.
This fixes an old, forgotten, vocabulary mistake.
To be consistent with the other modules, the positioning server must be called OwlPS Positioner instead of Positioning, and the executable owlps-positionerd (even if the daemon mode is not implemented yet). That's a big commit for a tiny change.