actualised forgotten Magnus's patch for plpgsql MOVE statement

Hello

I refreshed Magnus's patch
http://archives.postgresql.org/pgsql-patches/2007-02/msg00275.php from
februar.

Regards

Pavel Stehule

p.s. scrollable cursors in plpgsql need little work still. I forgot for
nonstandard (postgresql extension) direction forward all, forward n,
backward n. Forward all propably hasn't sense.

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