* Eliminate BELL, USHORT_SIZE, ULONG_SIZE, DBFLT_SIZE, UNSIGNED_SHIFT,

* Eliminate BELL, USHORT_SIZE, ULONG_SIZE, DBFLT_SIZE, UNSIGNED_SHIFT,
  FLONUM_EXPT_SIZE, FLONUM_MANTISSA_BITS, MAX_FLONUM_EXPONENT, quick.

* Rename `Exit_Scheme' macros to upper case.

* New macro UNSIGNED_SHIFT_BUG has opposite meaning of old
  UNSIGNED_SHIFT -- it says that the compiler uses arithmetic right
  shift on the `unsigned long' type.

* Redo MIPS configuration to handle non-DEC machines.

* Add configurations for i386 and NeXT.

* Eliminate `term_type' definition -- HP's compiler no longer has this
  problem.

* Change `FIXNUM_TO_LONG' to use more efficient conversion suggested
  by Aubrey Jaffer.