- Reformat ptrace.c for readability.

 - Handle lazy fpu context switches correctly for ptrace(2).
 - Don't read $fcr31 on context switch, it's pure bloat.
 - New processes get $fcr31 initialized to no exceptions.
 - First beginnings of floating point support kernel code.  For now we
   only can handle cvt.w.s and cvt.w.d instructions where the source
   register is a NaN, infinity or denorm.  This is good enough to get
   Mozilla up.
 - Don't send SIGFPE on every floating point instruction we don't know
   how to handle, rather just complain.
 - Cleanup headerfile inclusions in the HPC3 code.
 - Fix the definition of PAGE_NONE.

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