Bugfix/windows

The Windows things do no longer work with recent Windows/Docker combos. This merge request add a Windows batch file rundune.bat (just a "translated" version of rundune.sh) which can be run directly from the Windows powershell app.

The user-id is fixed at 4511 for this case as the setup no longer relies on an installed MingW environment so there is no external user-id which has to be matched.