npgsql - Npgsql2: Applied Gildas Prime patch with Gendarme report

Log Message:
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Applied Gildas Prime patch with Gendarme report corrections:

Avoid concatenating chars rule ( i.e Unneeded boxing)
A recursive method was found (Method remove in NpgsqlParameterCollection)
Disposable fields should be disposed
Do not lock on this ( lock(this) makes very difficult to ensure that the locking is done correctly.)
Ensure that local variables are disposed surrounding them by using()

Modified Files:
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Npgsql2/src/Npgsql:
Cache.cs (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/Cache.cs?r1=1.1&r2=1.2)
NpgsqlCommand.cs (r1.58 -> r1.59)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlCommand.cs?r1=1.58&r2=1.59)
NpgsqlCommandBuilder.cs (r1.20 -> r1.21)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlCommandBuilder.cs?r1=1.20&r2=1.21)
NpgsqlConnector.cs (r1.38 -> r1.39)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlConnector.cs?r1=1.38&r2=1.39)
NpgsqlState.cs (r1.23 -> r1.24)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlState.cs?r1=1.23&r2=1.24)
PGUtil.cs (r1.16 -> r1.17)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/PGUtil.cs?r1=1.16&r2=1.17)
NpgsqlConnectorPool.cs (r1.21 -> r1.22)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlConnectorPool.cs?r1=1.21&r2=1.22)
Npgsql2/src/NpgsqlTypes:
BitString.cs (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/NpgsqlTypes/BitString.cs?r1=1.5&r2=1.6)