tsvector extraction patch

hello,

this patch has not made it through yesterday, so i am trying to send it 
again.
i made a small patch which i found useful for my personal tasks.
it would be nice to see this in 8.5. if not core then maybe contrib.
it transforms a tsvector to table format which is really nice for text 
processing and comparison.

test=# SELECT * FROM tsvcontent(to_tsvector('english', 'i am pretty sure 
this is a good patch'));lex   | rank
--------+------
good   |    8
patch  |    9
pretti |    3
sure   |    4
(4 rows)
  many thanks,
     hans

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