add duplicate flags settings and flag unset tests
add duplicate flags settings and flag unset tests

auraphp/Aura.Sql,paska27/sql-builder,JLacoude/Aura.Sql,cxj/Aura.SqlQuery,NateJacobs/Aura.Sql,auraphp/Aura.SqlMapper_Bundle,auraphp/Aura.SqlSchema,gsouf/Aura.SqlQuery,jakejohns/Aura.SqlSchema,auraphp/Aura.SqlQuery,cxj/Aura.SqlMapper_Bundle,dstockto/Aura.SqlQuery,sasha-ch/Aura.Sql,harikt/Aura.SqlQuery,frederikbosch/Aura.Sql,ThisIsPuzzle/Aura.Sql