New Expert Mode item in the File Menu.
Frontier looks at user.preferences.expertMode to decide if the item is checked.
When selected, the script system.misc.toggleExpertMode is called.
Frontier no longer automatically installs system.misc.menubar.
The management of expert mode is entirely under the control of the database
system.startup.startupScript calls a new verb: menu.installMainMenu.
This should fix the old bug of the user.initials menu displaying wrong when Frontier is first personalized.