proposal: auxiliary functions for record type

Hello

I wrote a few functions for record type - record_expand,
record_get_fields, record_get_field, record_set_fields.

A usage of this functions is described in my blog
http://okbob.blogspot.com/2010/12/iteration-over-record-in-plpgsql.html

Do you think, so these functions can be in core? These are relative
strong and enough general with zero dependency. Sure, these functions
are not defined in ANSI SQL.

Regards

Pavel Stehule