add new signal which generate when record must be added is invalid
and querys for add book delete it and swap another
add parenthese
change invalid driver name 'SQLITE' onto 'QSQLITE'
add comma into query
a lot of changes in internal structure of model to make it usable as
QSqlTableModel
corect sql queryes (surround string constants with '')
function now work with copys of objects( references not avaliable
because it is Qt)))