[ADMIN] Determine PG version used for initdb

[Hannes Dorbath]

Is it possible to determine if PG 8.0.1's initdb or PG 8.0.3's initdb 
was used to init a cluster? I fear I am accidental running a 8.0.1 
postmaster on a 8.0.3 cluster due to wrong env vars :(

Do I have to fear corruption btw?
Thanks

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