Log Message:
Update to 6.0.0a:

Changes between 6.0.0 and 6.0.0a:
Not documented.

Changes between GMP version 5.1.* and 6.0.0

  BUGS FIXED
  * The function mpz_invert now considers any number invertible in Z/1Z.

  * The mpn multiply code now handles operands of more than 2^31 limbs
    correctly.  (Note however that the mpz code is limited to 2^32 bits on
    32-bit hosts and 2^37 bits on 64-bit hosts.)

  * Contains all fixes from release 5.1.3.

  SPEEDUPS
  * Plain division of large operands is faster and more monotonous in operand
    size.

  * Major speedup for ARM, in particular ARM Cortex-A15, thanks to improved
    assembly.

  * Major speedup for SPARC T4/T5 and speedup also for T3, thanks to a lot of
    new assembly.

  * Speedup for Intel Sandy Bridge, Ivy Bridge, Haswell, thanks to rewritten
    and vastly expanded assembly support.  Speedup also for the older Core 2
    and Nehalem.

  * Faster mixed arithmetic between mpq_class and double.

  * With g++, optimise more operations when one argument is a simple constant.

  FEATURES
  * Support for new Intel and AMD CPUs.

  * Support for ARM64 alias Aarch64 alias ARMv8.

  * New public functions mpn_sec_mul and mpn_sec_sqr, implementing side-channel
    silent multiplication and squaring.

  * New public functions mpn_sec_div_qr and mpn_sec_div_r, implementing
    side-channel silent division.

  * New public functions mpn_cnd_add_n and mpn_cnd_sub_n.  Side-channel silent
    conditional addition and subtraction.

  * New public function mpn_sec_powm, implementing side-channel silent modexp.

  * New public function mpn_sec_invert, implementing side-channel silent
    modular inversion.

  * Better support for applications which use the mpz_t type, but nevertheless
    need to call some of the lower-level mpn functions.  See the documentation
    for mpz_limbs_read and related functions.

  MISC
    [FreeBSD bashing removed]