added gcc-6-debug-c++17  config cuz having trouble building gcc 6 on ununtu 17.10
added gcc-6-debug-c++17  config cuz having trouble building gcc 6 on ununtu 17.10

SophistSolutions/Stroika,SophistSolutions/Stroika,SophistSolutions/Stroika,SophistSolutions/Stroika,SophistSolutions/Stroika