Support SET FROM CURRENT in CREATE/ALTER FUNCTION, ALTER DATABASE, ALTER ROLE.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: e7889b83b7059e776f0a3d76bbbdd98687f4592c
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-09-03T18:46:30Z
Releases: 8.3.0
Support SET FROM CURRENT in CREATE/ALTER FUNCTION, ALTER DATABASE, ALTER ROLE.
(Actually, it works as a plain statement too, but I didn't document that
because it seems a bit useless.)  Unify VariableResetStmt with
VariableSetStmt, and clean up some ancient cruft in the representation of
same.

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