Minor improvements

-default gcc version = 4.7 (should be faster)
-add folder /supplementary/scripts
-move input scripts to /supplementary/scripts
-retroarch: add "make clean" (had an update problem)
-runcommand.sh: add sdtv modes, add 50Hz modes, add switch cpu_governor ("performance" = max. CPU clock), check if tv supports CEA HDMI mode.