Add double wrap rope
Minor extensions for double wrap. See also:
https://www.digipara.com/Portals/0/MC/WEB-EN/Default.htm#DP/LD/DB/MDF/02_Elevators/06 Traction Units/DoubleWrapTraction.htm
Andreas Fleischmann
5/24/2017
Minor extensions for double wrap. See also:
https://www.digipara.com/Portals/0/MC/WEB-EN/Default.htm#DP/LD/DB/MDF/02_Elevators/06 Traction Units/DoubleWrapTraction.htm