+preferences: showToolbarAddBtn and showToolbarQuickAddBtn
+additional toolbar buttons
! set needRefresh after all bookmarks/folders changes
+ overlay.js: setAdditionalButton(), quickAddBookmark()
+ bkmrk_add_quick_off.png
+ bkmrk_add_quick_on.png
removed commented old code
! change module from fGoogleBookmarksExtension to fGoogleBookmarksModule