patch applied (packages/HaXml): Change meaning of " //" in Xtract query from deep to multi.

[Malcolm Wallace]

Thu Feb  1 03:04:59 PST 2007  Malcolm.Wallace at cs.york.ac.uk
  * Change meaning of "//" in Xtract query from deep to multi.
  When a query contains a predicate, a tag-match for which the predicate
  failed, caused searching to ignore the subtree.  This is due to the
  semantics of the "deep" combinator.  "deepest" would look at the subtree
  first, but this turns out to give surprising results for certain other
  predicate queries.  Using "multi" ensures that both the local root _and_
  its subtree are searched.  (However, one should be aware that the same
  subtree might now occur in the results more than once, if the predicate
  matches at both an inner and an outer level of nesting.)

    M ./src/Text/XML/HaXml/Xtract/Parse.hs -2 +2