First batch of object rename commands.

doc/src/sgml/ref/allfiles.sgml

doc/src/sgml/ref/alter_aggregate.sgml

doc/src/sgml/ref/alter_conversion.sgml

doc/src/sgml/ref/alter_database.sgml

doc/src/sgml/ref/alter_function.sgml

doc/src/sgml/ref/alter_group.sgml

doc/src/sgml/ref/alter_language.sgml

doc/src/sgml/ref/alter_opclass.sgml

doc/src/sgml/ref/alter_schema.sgml

doc/src/sgml/ref/alter_user.sgml

doc/src/sgml/ref/create_aggregate.sgml

doc/src/sgml/ref/create_conversion.sgml

doc/src/sgml/ref/create_function.sgml

doc/src/sgml/ref/create_language.sgml

doc/src/sgml/ref/create_opclass.sgml

doc/src/sgml/ref/create_schema.sgml

doc/src/sgml/ref/drop_aggregate.sgml

doc/src/sgml/ref/drop_conversion.sgml

doc/src/sgml/ref/drop_function.sgml

doc/src/sgml/ref/drop_language.sgml