Added debian folder from hunterk PPA, updated Standards-Version, debhelper and compat, fixed lintian warnings and errors: added missing build-dependends and depends in debian/control, added simple man pages to cg2glsl and retrolaunch tools and fixed desktop entry. Added quilt patch (retroarch.cfg, friendly path to libretro cores and start directory), so you can change files only to debian system. Package has one lintian error yet: missing-dependency-on-libc.