npgsql - Npgsql2: Readded ability to log the string being written to

Log Message:
-----------

Readded ability to log the string being written to server. It was removed in the last optimization (version 1.5) by mistake.

Modified Files:
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Npgsql2/src/Npgsql:
PGUtil.cs (r1.11 -> r1.12)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/PGUtil.cs?r1=1.11&r2=1.12)
NpgsqlQuery.cs (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/NpgsqlQuery.cs?r1=1.7&r2=1.8)