Displays the main "Download New Packages" page.

• Requires the admin_forum permission
• Part of the "manage_packages" adminIndex
• Loads the Packages template and language files
• Default sub-action for the packageget action
• Accessed at index.php?action=packageget or index.php?action=packageget;sa=servers in 1.1
• Accessed at index.php?action=admin;area=packages;get;sa=servers in 2.0