uniqueidentifier datatype for 7.3.X

Hi All!

I've ported uniqueidentifier datatype to upcoming PostgreSQL 7.3. It's
available at
http://www.taurussoft.org/files/uniqueidentifier-0.1.9.3.tar.gz
In this release there is additional function uniqueidentifier_text()
which converts uniqueidentifier to text datatype. Thanks to Hussein
Patni!

Version for 7.2.X is available at
http://www.taurussoft.org/files/uniqueidentifier-0.1.9.2.tar.gz
Version for 7.1.X is available at
http://www.taurussoft.org/files/uniqueidentifier-0.1.9.1.tar.gz
The only difference between two releases is adoptation to 7.2.X system
catalog. No new functions/bugfixes.

Uniqueidentifier datatype is 128-bit (16 byte) wide datatype claims to
be unique across Universe. It's a good choice for primary indexes and
making relations between tables.
This inplementation depends on libuuid library from e2fsprogs package by
Theodore Ts'o.
Licence is LGPL.

Regards,
Dmitry