[HACKERS] pg_catversion builtin function

Hi Hackers,

Attached is a new builtin function that exposes the CATALOG_VERSION_NO 
constant under the pg_catversion() function, e.g.

test=# SELECT pg_catversion();
  pg_catversion
---------------
      201612121
(1 row)

Although it mostly useful during the development cycle to verify if 
dump/restore is needed; it could have other use-cases.

I'm unsure of the OID assignment rules - feel free to point me towards 
information regarding this.

I'll register this patch with the next CF.

Best regards,
  Jesper

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