- update to 1.4.19:
  * New QueryParser::FLAG_NO_POSITIONS flag.  With this flag enabled, any query
    operations which would use positional information are replaced by the nearest
    equivalent which doesn't (so phrase searches, NEAR and ADJ will result in
    OP_AND).  This is intended to replace the automatic conversion of OP_PHRASE,
    etc to OP_AND when a database has no positional information, which will no
    longer happen in the release series after 1.4.
  * Give a compile error for code which adds a Database to WritableDatabase.
    Prior to 1.4.19, this compiled and effectively created a "black-hole" shard
    which quietly discarded any changes made to it.
    In 1.4.19 it's still possible to perform this operation by assigning the
    WritableDatabase to a Database first, which is harder to fix.  This case
    throws an exception on git master where it's easier to address.
  * Fix TermIterator::skip_to() with sharded databases which sometimes was
    failing to advance all the way to the requested term.  Uncovered while
    addressing warning from GCC's -Wduplicated-cond, reported by dcb in #816.
  * Clamp edit distance to one less than the length of the word we've been asked
    to correct, which makes the algorithm we use more efficient.  We already
    require suggestion to have at least one character in common, so the only
    change to suggestions is we'll no longer suggest corrections which are
    twice as long or longer even if the edit distance would allow it, which
    seems like an improvement in itself.
  * Minor optimisation expanding wildcards.
  * PostingIterator::get_description(): For an all-docs iterator on a glass
    database, get_description() would call get_docid() which isn't valid to
    do once the iterator has reached the end.
  * Expand allterms test coverage.
  * Fetch wdf upper bound from postlist which avoids an extra postlist table
    cursor seek per weighted query term, and also means we now use a per-shard
    wdf upper bound for local shards which will in typically give a tighter

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