Improve error message when view is not updatable

Peter Eisentraut <peter_e@gmx.net>

Commit: 32f7c0ae1725031e8ed3620e06e94007a171d6d5
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2013-08-15T03:02:59Z
Releases: 9.4.0
Improve error message when view is not updatable

Avoid using the term "updatable" in confusing ways.  Suggest a trigger
first, before a rule.

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