AppMan: display download progress in the taskbar on Win7+

[Gama11]

Windows7+ can display a progress bar in the taskbar which would be very handy for the AppMan. However, that requires the "Windows API Code Pack for .NET" with NET versions < 4.

http://stackoverflow.com/questions/4155003/net-progress-bar-in-taskbar-on-windows-7
http://stackoverflow.com/questions/24081665/windows-api-code-pack-where-is-it