pgsql: Improve error messages for missing-FROM-entry cases, as per - Mailing list pgsql-committers

Log Message:
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Improve error messages for missing-FROM-entry cases, as per recent discussion.

Tags:
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REL8_1_STABLE

Modified Files:
--------------
    pgsql/src/backend/parser:
        parse_relation.c (r1.116.2.1 -> r1.116.2.2)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_relation.c.diff?r1=1.116.2.1&r2=1.116.2.2)
    pgsql/src/test/regress/expected:
        rowtypes.out (r1.3 -> r1.3.2.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/rowtypes.out.diff?r1=1.3&r2=1.3.2.1)