fix to bug 171 submitted along with user documentation

[Rick Hillegas]

I have attached a fix to bug 171 to its JIRA page. Bug 171 is an 
enhancement request for beefing up UPDATE and DELETE statements with the 
ANSI clauses for correlation names. I would appreciate a review.

If these changes commit, please note that I have also attached a brief 
description of related changes that we will need to make to the 
Reference Manual.

Thanks,
-Rick