(library) Checkboxes are not displayed anymore
(gui) Focus is not hacked anymore
(gui) Fixed a bug on selection after a refresh
(gui) Fix selection with context menu & comboBox

Still need to select parent folder when all children are selected
(refactoring) Updte some variables names
(library) Select parent folder when all children have been
(gui) Improve efficiency on selection with combo / menu
(selection) Expand parent when selecting it by combo
(gui) Add basic shortcuts to main functions
Update CHANGES and version number