Add proallargtypes and proargmodes columns to pg_proc, as per my earlier

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

Commit: 0f085f6e9df81140ee69f29f31f42b2824f0afed
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-03-29T19:44:23Z
Releases: 8.1.0
Add proallargtypes and proargmodes columns to pg_proc, as per my earlier
proposal for OUT parameter support.  The columns don't actually *do*
anything yet, they are just left NULLs.  But I thought I'd commit this
part separately as a fairly pure example of the tasks needed when adding
a column to pg_proc or one of the other core system tables.

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