Log Message:
Update to 1.4.7. From the changelog:

omega:

* New OmegaScript $unique command.  The existing $uniq only removes adjacent
  entries (like the Unix uniq command) so to fully remove duplicates you need a
  sorted input.  Sometimes it is desirable to remove duplicates from an
  unsorted list without changing the order of the entries which are left, so
  add $unique to do that.  If the list is sorted already, then $uniq is more
  efficient.

* Fix $map to cleanly reject a single argument.

templates:

* templates/query: Merge multiple entries in the term frequency information,
  which came from searching several prefixes by default.  Reported by Alistair
  Buxton on #xapian-discuss.

* When multiple words with the same stem are in the query string we now fully
  eliminate duplicates when showing term frequency information.