What is Hidden User Information (Userinfo) List in SharePoint 2010/2013 and how to fix when it causes a site collection to show old User metadata properties in People Picker control or in a Person or Group column?

What is the User Information List in SharePoint?   The User Information List (“/_catalogs/users/simple.aspx” or “_catalogs/users/detail.aspx”) is a hidden list in each site collection that is only visible and accessible to Site Collection Administrators.  The User Information List stores metadata information about a user. Some metadata examples are Display Name (name), Login Name (samAccountName), Department, Picture,…

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