Adapting existing extensions to use CREATE EXTENSION

Hi folks,

I've been looking at converting my existing "debversion" datatype
extension to use the proper "CREATE EXTENSION" facility for 9.1,
while also being backward compatible with 8.4 and 9.0.

My initial work on the conversion is here:
http://people.debian.org/~rleigh/postgresql-debversion_1.0.5.orig.tar.gz

(this is based upon looking at how citext handles it plus the
documentation and information at pgxn.org)

Note that it uses autoconf/make rather than relying on PGXS.
Extension support is disabled with --disable-extension. When
disabled, it still installs a compatibility script in
contrib/ to allow existing scripts to function (but it just
wraps CREATE EXTENSION rather than doing everything by hand).

I was wondering if anyone could possibly look it over to see if
I'm missing anything, or doing anything stupid that I shouldn't
in the new order of things. I'll release it and make it available
on PGXN once I'm happy it's OK.

Many thanks,
Roger

--
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