Implement differentiation between CURRENT_USER and SESSION_USER as per SQL.

Peter Eisentraut <peter_e@gmx.net>

Commit: 457ac0331cd3e28ecc5d783e7504645837c41a1d
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2000-09-19T18:18:04Z
Releases: 7.1.1
Implement differentiation between CURRENT_USER and SESSION_USER as per SQL.
There is still no effective difference but it will kick in once setuid
functions exist (not included here).  Make old getpgusername() alias for
current_user.

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