npgsql - Npgsql2: Fixed error message: Backend sent unrecognized

Log Message:
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Fixed error message: Backend sent unrecognized response type: q. There was an error on Error message handling where we were letting some fields without processing. Thanks Eric Montague (eric @nospam@ nuws.com) for heads up and tests.

Modified Files:
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Npgsql2/src/Npgsql:
NpgsqlError.cs (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlError.cs.diff?r1=1.4&r2=1.5)