Single provider at a time UI
Changes to discuss.
the entire main window has a heading for a single provider
login area has no provider dropdown
combine all preferences into one window, for one provider only
remove the ability to change providers from within the main window.
In order to change provider, you select 'switch provider' menu item. This action automatically logs you out and stops vpn, and then displays a provider selection window, with a item or button to add a provider.
(from redmine: created on 2013-12-09, closed on 2014-09-29, relates #5929 (closed), relates #5912 (closed), relates #4119 (closed))