npgsql - Npgsql2: Fixed a test which were leaking a datareader open.

Log Message:
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Fixed a test which were leaking a datareader open.

Added bug tests

Added initial massive datatype testcase.

Modified Files:
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Npgsql2/testsuite/noninteractive/NUnit20:
CommandTests.cs (r1.47 -> r1.48)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/testsuite/noninteractive/NUnit20/CommandTests.cs?r1=1.47&r2=1.48)