Print function signature, not just name, in PL/pgSQL error messages.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 4c6cedd1b014abf2046886a9a92e10e18f0d658e
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2012-01-31T08:36:20Z
Releases: 9.2.0
Print function signature, not just name, in PL/pgSQL error messages.

This makes it unambiguous which function the message is coming from, if you
have overloaded functions.

Pavel Stehule, reviewed by Abhijit Menon-Sen.

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