Implement Xoroshiro116+ and improve statisticals

Implement Xoroshiro116+ as 'exrop' with fixes.

Deprecate all old algorithms but reincarnate 'exs1024' as 'exs1024s'
and 'exsplus' as 'exsp' with fixes.

Fixes:
* Avoid skew for uniform integers caused by using a simple 'rem'
  operation for range confinement.  Correctness requires retry
  with new random value for an unfortunate first value.
* Implement a correct algorithm that collects enough random
  bits for ranges larger than the generator's precision.
* Fix uniform density for floats by acquiring 53 bits
  then multiplying with 2.0^(-53) which produces floats
  on the form N * 2.0^(-53).

0 files changed, 0 insertions, 0 deletions