Fix createchildusergroup

[joramwangi]

Sorry about the whitespace. main change was

public virtual UsersGroup CreateChildUserGroupOf(string parentGroupName, string usersGroupName)
     {
       UsersGroup parent = GetUsersGroupByName(parentGroupName);
       Guard.Against<ArgumentException>(parent == null,
                                        "Parent users group '" + parentGroupName + "' does not exists");

       UsersGroup group = CreateUsersGroup(usersGroupName);
       group.Parent = parent;
       group.AllParents.AddAll(parent.AllParents);
       group.AllParents.Add(parent);
       parent.DirectChildren.Add(group);
-      parent.AllChildren.Add(group);
+            foreach(UsersGroup prnt in group.AllParents)
+            {
+                prnt.AllChildren.Add(group);
+            }
+
         return group; 
     } 

Initially only direct children were being added and thus if in a nested scenario group.AllChildren will only return direct children unlike group.AllParents

[nrstott]

Can you resolve the conflicts first please? I'm not in a good position to resolve them as I have not worked with this code base in a while. Thanks for the work though! I'll be happy to merge when you resolve the conflicts.

[joramwangi]

All tests pass except for RemovingUserFromGroupInvalidatesSecondLevelCache()