add new --section-only and --suppress-verticals command line options
add new --section-only and --suppress-verticals command line options

jefrench/latex2edx,jefrench/latex2edx,evheubel/latex2edx,mitocw/latex2edx,evheubel/latex2edx,jefrench/latex2edx,evheubel/latex2edx,mitocw/latex2edx,mitocw/latex2edx