- new note class

- improved performances (much less duplicated mysql queries)
- less code and better error handling
- fix various bugs

tables/appdb_tables.sql

@@ -208,7 +208,6 @@ create table appNotes (
 	noteId          int not null auto_increment,
 	noteTitle       varchar(255),
 	noteDesc        text,
-	appId           int not null,
 	versionId       int not null,
 	key(noteId)
 );