npgsql - Npgsql2: Initial support for bug fix reported in message

Log Message:
-----------
Initial support for bug fix reported in message 1005698.  The fix changes valid sql that produced incorrect results to
sometimesvalid sql that produced correct results when valid.   Also contains work in progress to resolve the invalid
sql.

Modified Files:
--------------
    Npgsql2/src/Npgsql/SqlGenerators:
        SqlBaseGenerator.cs (r1.25 -> r1.26)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/SqlGenerators/SqlBaseGenerator.cs?r1=1.25&r2=1.26)
        SqlDeleteGenerator.cs (r1.7 -> r1.8)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/SqlGenerators/SqlDeleteGenerator.cs?r1=1.7&r2=1.8)
        SqlInsertGenerator.cs (r1.11 -> r1.12)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/SqlGenerators/SqlInsertGenerator.cs?r1=1.11&r2=1.12)
        SqlSelectGenerator.cs (r1.9 -> r1.10)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/SqlGenerators/SqlSelectGenerator.cs?r1=1.9&r2=1.10)
        SqlUpdateGenerator.cs (r1.7 -> r1.8)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/SqlGenerators/SqlUpdateGenerator.cs?r1=1.7&r2=1.8)
        VisitedExpression.cs (r1.14 -> r1.15)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/SqlGenerators/VisitedExpression.cs?r1=1.14&r2=1.15)