Keyboard navigation

Less clicking. [Also use of function keys and other keystrokes for actions; ability to set keystrokes for specific functions as we can do in Connexion (Pat--Chicago)]. Some keyboard shortcuts are definitely planned but not sure about ability to customize (agree that it's needed). (Laura)

@Cult: we need to have the final list of keyboard shortcuts from FOLIO, to associate them to the different functions listed in the several MARCcat menu.