pgsql: Add proallargtypes and proargmodes columns to pg_proc, as per my

Log Message:
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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.

Modified Files:
--------------
pgsql/doc/src/sgml:
bki.sgml (r1.13 -> r1.14)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/bki.sgml.diff?r1=1.13&r2=1.14)
catalogs.sgml (r2.98 -> r2.99)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/catalogs.sgml.diff?r1=2.98&r2=2.99)
pgsql/src/backend/bootstrap:
bootstrap.c (r1.200 -> r1.201)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/bootstrap/bootstrap.c.diff?r1=1.200&r2=1.201)
pgsql/src/backend/catalog:
pg_proc.c (r1.124 -> r1.125)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_proc.c.diff?r1=1.124&r2=1.125)
pgsql/src/include/catalog:
catversion.h (r1.261 -> r1.262)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h.diff?r1=1.261&r2=1.262)
pg_attribute.h (r1.114 -> r1.115)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_attribute.h.diff?r1=1.114&r2=1.115)
pg_class.h (r1.85 -> r1.86)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_class.h.diff?r1=1.85&r2=1.86)
pg_proc.h (r1.355 -> r1.356)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h.diff?r1=1.355&r2=1.356)