(library) Reconnect actions update for checked items changes
(gui) Fix library view columns sizes
(refactoring) Fix enums for tables indexes
(refactoring) Rename some LibraryModel methods
(librarymodel) Implements method to get a record from an index
(librarymodel) Return 4 as columnCount everytime
(librarymodel) Fix crash when refreshing the second time
(mainwindow) Update connection methods
(librarymodel) Fix items returned by checkedXXX methods