(disabled by default), before it always was used and now its
only done if you select this option, if you disable this option
you can enable video patches and whatever and they finally work
-added new option, "force_cios_rev" (default 0 (=disabled)), if you
set it to for example "force_cios_rev=250", then wiiflow will
use IOS250 for the AUTO setting, for reload when using
"force_cios_load" and when switching to emu nand in IOS58 mode
-added more detailed debug prints and on screen information about
the currently loaded cIOS
-minor cleanup in nand get file and external booter