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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