changed: db: table item: url_subject into url

changed: item.url_subject into item.url
changed: a new table: content
         with: id, subject, content, content_type
         (those from the item table)
         it helps to create hard links


git-svn-id: svn://ttmath.org/publicrep/cmslu/trunk@466 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/item.h

@@ -19,9 +19,19 @@ struct Item
 {
 long id;
 
+
+long user_id;
+long group_id;
+int privileges;
+
+
 std::string subject;
 std::string content;
-std::string url_subject;
+std::string url;
+
+
+int content_type;
+
 
 enum Type
 {
@@ -41,6 +51,9 @@ long parent_id;
 long default_item;
 
 
+// used by the database
+long content_id;
+
 
 Item()
 {
@@ -52,13 +65,22 @@ Item()
 void Clear()
 {
 	id = -1;
+	
+	user_id = -1;
+	group_id = -1;
+	privileges = 0;
+	
 	subject.clear();
 	content.clear();
-	url_subject.clear();	
+	url.clear();	
+	
+	content_type = 0;
 	
 	type = none;
 	parent_id = -1;
 	default_item = -1;
+
+	content_id = -1;
 }