LZTEXT for rule plan stings

Hi,

    there  was  discussion  about  readding  the  lztext type for
    internal use in pg_rewrite for 7.0, then remove it again once
    we have TOAST.

    Was  because  significant growth of the rule plan strings due
    to other changes can cause views/rules to be rejected by 7.0,
    that easily worked with 6.5.

    I've reconstructed the entire lztext type now from CVS, could
    reapply changes and reactivate deleted  files  from  ./Attic.
    Will  work on a NOTICE/ERROR message now, preventing users to
    use it in their schemas.

    But it requires an initdb and we're in BETA. So I better  ask
    if someone complains.


Jan

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