o New memset. Fastest in town for size > 6 bytes.

 o New clear_user.
 o Memcpy now efficiently copies the (src^dest)&3 != 0.
 o Memmove new correctly deals with overlaps
 o Rewrite csum_partial in assembler.
 o Rewrte csum_partial_from_user in assembler.
 o __copy_user is now integrated with memcpy.
 o get_user now returns a zero value on error.
 o copy_from_user now clears the destination buffer on error.
 o strncpy_user now has a more efficient caller routine.
 o strlen_user now has a more efficient caller routines and is faster.
 o The unaligned handler is now much cleaner.  It's now also save from
   interrupt.  Some more esotheric bugs fixed as well.
 o Don't export bcopy anymore, it's now a inline function.
 o Delete ancient junk from the first days of Linux/MIPS.
 o Delete dead code in indy_sc.c.
 o Including the IDE driver doesn't crash an Indy anymore.
 o Eleminate active_ds.  We now use current_ds directly in the thread
   structure which is faster and threadsafe.  Saves almost 2kb on the
   kernel.
 o Serial console should work again.

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