Log Message:
-----------
simplified boolean expressions when a not is applied
Modified Files:
--------------
Npgsql2/src/Npgsql/SqlGenerators:
SqlBaseGenerator.cs (r1.22 -> r1.23)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql/SqlGenerators/SqlBaseGenerator.cs?r1=1.22&r2=1.23)