Add a "Network Admin" link to WP Admin Bar

[danielbachhuber]

Currently on a multisite instance, the super admin must first navigate to the dashboard (using a link on the left in the admin bar) and then use a dropdown menu all of the way on right of the dashboard that requires a click to access the Network Admin.

In short, this is frustratingly complex. There should be a way to easily access the Network Admin from the admin bar.

I propose we add a "Network Admin" link for Super Admins in the account dropdown, similar to this:

​http://www.danielbachhuber.com/screenshots/Dashboard_%E2%80%B9_Network_Admin_%E2%80%94_WordPress-20110707-191102.jpg

Optionally, we could add sub menus to the primary sections of the Network Admin like so:

​http://www.danielbachhuber.com/screenshots/Dashboard_%E2%80%B9_Network_Admin_%E2%80%94_WordPress-20110707-191454.jpg

Patch for the former coming shortly.

Add a "Network Admin" link to the account dropdown in the admin bar

You can always acces your Network Admin in de dropdown menu (Howdy, Your Name) in the upper-right corner. And if you click on My Sites in the Admin bar you get an overview of your sites in de MU.
So I don't think that it is very complex, but you just have to know it.

Related: #17970, #18197

Plugin for testing the link under the "Profile" dropdown

Created a plugin for doing usability testing on the link. Plugin can be network activated for use across the entire network

Network Admin link was moved to the admin bar in [18683].