More cleaning of the exception handling code, and collateral damage:

- always give C routines invoked by the assembly code some breathing room on
  the stack
- merge error and reset exception handlers -- gets us rid of error_fault()
  and error_reset().
- remove all references to SR0 and "threads" inherited from Mach. In fact,
  we do not use SR0 at all now.
- only use double load and stores instructions when we are 200% sure we are
  accessing a correctly aligned area. I am not fond of unaligned kernel
  accesses, and forcing every pgb to be aligned on an 8 byte boundary is
  gross.

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