Server: Disable Notifications per User

[Koleckai Silvestri 1150]

There is no need for my family to see that a new beta version has been released or that the server was upgraded and installed. We should be able to disable these notifications for these users. I have everything set to Administrators only under but new release announcements and server updates still get added to all users. Would like to use the Content Added notifications but they always get drowned out with administrivia that means nothing to end users.