Kernel Stack

Set to 0x20000 down to 0x10000, no segmentation because apparently GCC
breaks (stupid GCC) from what I hear if you have different SS and DS.

Removed "none" file from clean.bat because it turns out it has something
to do with running bochs from the bxrc file (which I had in that
directory at the time).

Renamed kstub to kstub.o since it is an ELF output.