Put latest version available in status bar

[butler]

on startup, SasView checks for what the latest published version is and puts the information in the log file. While the user can actively go to the menu item Help > Check for updates, the user should be informed as soon as the information is available. If the running version is behind the latest that information should be displayed in the status bar/console at startup along with being logged. If no internet connection is available however the status bar should remain empty (i.e. no error should be thrown in the status bar/console).