corrected: in some places declarations of classes where mixed with struct (class/struct)

git-svn-id: svn://ttmath.org/publicrep/winix/trunk@812 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/item.h

@@ -110,8 +110,8 @@ private:
 	long content_id;	// content id in 'content' table
 	int  ref;			// content references
 
-friend class Db;
-friend class DbItemColumns;
+friend class  Db;
+friend struct DbItemColumns;
 };