How to create a new portable Windows distribution of OpenSlides:
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1.) Follow the OpenSlides installation instructions for windows,
    but add the option "-Z" when executing easy_install, e.g.:

      easy_install -Z django django-mptt beautifulsoup4 bleach pillow qrcode reportlab tornado

2.) Run in the main directory of the OpenSlides checkout:

      python extras\win32-portable\prepare_portable.py

3.) The portable OpenSlides distribution is now ready as a zip archive 
    in the 'dist' directory


NOTE: Creating the portable Windows distribution of OpenSlides is not possible
if Python is installed in 64-bit(!) version.