Implement properly ordered list of certificates
The certificate list (identity list) is now sorted according to date, either the
notBefore date for certs or the date derived from the directory name. If neither
works, the current time is used. The entries are sorted in reverse chronological
order. It's best to delay setting up the list till after the store is loaded and
sorted. We also implement a contentsChanged() listener, which get triggered
(number of times unfortunately) during the sort() and updates the CTRL-<number>
shortcuts and the certificate menu.
Also update version of browsers