Merge branch '6.0' into 6.0-innerjoin-instead-of-leftjoin-issue

# Conflicts:
#	ChangeLog/6.0.14_dev.txt

Author: alex-kulakov

ChangeLog/6.0.14_dev.txt

@@ -1 +1,3 @@
-[main] In addition to previous version, more cases of incorrect join type usage addressed
+[main] Addressed issue of not visiting grouping expression correctly which appeared in previous version
+[main] Addressed certain issues of incorrect query optimization when it contains multiple In() calls
+[main] In addition to previous version, more cases of incorrect join type usage addressed

Orm/Xtensive.Orm.Manual/DomainAndSession/DomainAndSessionSample.cs

@@ -46,7 +46,7 @@ public class DomainAndSessionSample : HasConfigurationAccessTest
     public const string OracleUrl1     = @"oracle://user:password@localhost/MyDatabase";
     public const string OracleUrl2     = @"oracle://user:password@dbServer:5511/MyDatabase";
     public const string PostrgeSqlUrl1 = @"postgresql://user:[email protected]:8032/MyDatabase?Encoding=Unicode";
-    public const string PostrgeSqlUrl2 = @"postgresql://user:password@dbServer/MyDatabase?Pooling=on&MinPoolSize=1&MaxPoolSize=5";
+    public const string PostrgeSqlUrl2 = @"postgresql://user:password@dbServer/MyDatabase?Pooling=True&MinPoolSize=1&MaxPoolSize=5";
     public const string InMemoryUrl    = @"memory://localhost/MyDatabase";
 
     #endregion