refactored and disabled (by default) makefile configurations for private_compiler_versions_: myg++8.3, and my-clang++-7; left in makefile disabled so easy to re-include as needed if I need custom compiler build
refactored and disabled (by default) makefile configurations for private_compiler_versions_: myg++8.3, and my-clang++-7; left in makefile disabled so easy to re-include as needed if I need custom compiler build

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